taxonID	type	description	language	source
A22D87C94256FFE8FC9AF8D3FD2614CE.taxon	description	Description and iconography Ochyra et al. (2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94256FFE8FC9AF8D3FD2614CE.taxon	distribution	Distribution and habitat Aloina brevirostris has a bipolar distribution and in arid areas has been reported growing either in dry or temporally moist habitats. This species grows on stones and boulders, gravelly silt and soil or in rock crevices (Ochyra et al. 2008). Within the study area, it was found on the plateau and on the slope growing on soil sites both protected by rocks and on exposed zones. This species, together with Bryum pseudotriquetrum, was observed more frequently and formed larger plots, reaching 20 m 2. In most cases, it was observed growing alone or with lichens; however, it was also found growing together with other bryophytes.	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94256FFE8FC9AF8D3FD2614CE.taxon	discussion	Comments Aloina brevirostris is the only species of the genus reported from Antarctica. The species is characterized by having broadly ligulate leaves with strongly inflexed margins that cover the photosynthetic filaments and the cuculate apex (Ochyra et al. 2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94256FFE8FC9AF8D3FD2614CE.taxon	materials_examined	Examined material: Antarctica, Marambio Island, going down from the plateau towards Caleta Larsen (64 ° 13 ′ 53.8 ′ ’ S; 56 ° 36 ′ 27.97 ′ ’ W; 84 m. a. s. l.), on unprotected ground, 15.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5671); ibid., descending from the plateau towards the west coast, from the Very-High-Frequency Omnidirectional Range towards Streamlet La Tradición (64 ° 13 ′ 49.00 ′ ’ S; 56 ° 37 ′ 54.73 ′ ’ W; 23 m. a. s. l.), on unprotected ground, 17.1.2022, A. C. Cottet (BCRU 5688); ibid., Streamlet La Tradición (64 ° 13 ′ 58.01 ′′ S; 56 ° 37 ′ 35.76 ′′ W; 53 m. a. s. l.), on unprotected soil, 17.1.2022, A. C. Cottet (BCRU 5691); ibid., descending from the plateau towards the west coast by stream from the end of the track (64 ° 14 ′ 12.08 ′′ S; 56 ° 39 ′ 22.03 ′′ W; 46 m. a. s. l.), on unprotected ground, 19.1.2022, A. C. Cottet (BCRU 5696); ibid., streamlet from the end of the runway (64 ° 14 ′ 13.49 ′′ S; 56 ° 39 ′ 56.16 ′′ W; 12 m. a. s. l.), on unprotected ground, 19.1.2022, A. C. Cottet (BCRU 5700); ibid., Streamlet La Tradición (64 ° 13 ′ 59.70 ′′ S; 56 ° 37 ′ 55.92 ′′ W; 36 m. a. s. l.), on unprotected soil, 19.1.2022, A. C. Cottet (BCRU 5706); ibid., on the plateau on the way to La Remota (64 ° 14 ′ 48.62 ′′ S; 56 ° 38 ′ 16.22 ′′ W; 191 m. a. s. l.), on soil protected by rocks, 21.1.2022, A. C. Cottet (BCRU 5710); ibid., west coast, near Casa de Botes, streamlet zone to the north (64 ° 15 ′ 39.60 ′′ S; 56 ° 43 ′ 57.97 ′′ W; 18 m. a. s. l.), on unprotected soil, 29.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5730); ibid., streamlet zone to the south (64 ° 15 ′ 33.37 ′′ S; 56 ° 43 ′ 53.08 ′′ W; 16 m. a. s. l.), on unprotected soil, 30.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5736).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE8FFC2FD51FE641030.taxon	description	Description and iconography Ochyra & Zander (2002).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE8FFC2FD51FE641030.taxon	distribution	Distribution and habitat This species is considered endemic to Antarctica, with a large distribution on the continent. Bryoerythrophyllum antarcticum has been found in diverse environments, ranging from dry to humid, on loamy, sandy and rocky soils, along meltwater streams and on lake margins (Sollman 2015). In the study area, it was found on the plateau and in the slope zone, growing on soil protected by rocks as well as in exposed sites. The species was found both growing alone and with other bryophytes.	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE8FFC2FD51FE641030.taxon	discussion	Comments It differs from other species in the genus also present in Antarctica by its compact and low cushion shape (1.0 – 2.0 cm), having ovate leaves, entire at the apex, and small leafy shoots, arising especially from the upper part of the stems; rhizoids are scattered throughout the stem; and the leaves curved when dry, not crisp. The species found differs from its congeneric species Bryoerythrophyllum recurvirostrum because it has a toothed apex, more or less contorted leaves and the rhizoids are restricted to the basal portion of the stem. Also, B. antarcticum is easily confused with another species present in the study area, Didymodon brachyphyllus; however, the former is larger, with thin walls and loose basal cells, and the upper cells are densely covered with hollow papillae (Sollman 2015).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE8FFC2FD51FE641030.taxon	materials_examined	Examined material: Antarctica, Marambio Island, descending from the plateau towards the west coast from Las Cruces (64 ° 13 ′ 50.70 ′′ S; 56 ° 36 ′ 21.17 ′′ W; 188 m. a. s. l.), on unprotected ground, 16.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5675); ibid., on the plateau in La Chacarita next to transport (64 ° 14 ′ 32.26 ′′ S; 56 ° 37 ′ 25.32 ′′ W; 191 m. a. s. l.), on soil protected by rocks, 20.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5709).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE8FFC2F93AFAB21682.taxon	description	Description and iconography Ochyra et al. (2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE8FFC2F93AFAB21682.taxon	distribution	Distribution and habitat A cosmopolitan species with a wide range of habitats, both in dry and humid situations (Ochyra et al. 2008). In the survey area, it was found growing on the ground at exposed sites, exclusively in sloping zones together with other bryophytes.	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE8FFC2F93AFAB21682.taxon	discussion	Comments See comments for Bryoerythrophyllum antarcticum.	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE8FFC2F93AFAB21682.taxon	materials_examined	Examined material: Antarctica, Marambio Island, west coast, near Casa de Botes, streamlet zone to the north (64 ° 15 ′ 39.60 ′′ S; 56 ° 43 ′ 57.97 ′′ W; 15 m. a. s. l.), on unprotected soil, 29.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5731).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE8FC83FEACFA3A1509.taxon	description	Description and iconography Ochyra et al. (2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE8FC83FEACFA3A1509.taxon	distribution	Distribution and habitat Bryum argenteum has a cosmopolitan distribution, often associated with disturbed sites. In Antarctica, this species has been reported in maritime and continental areas, growing mainly in open sites in drainage areas and meltwater puddles; it also grows in places protected by rocks or recesses in the ground (Ochyra et al. 2008). In the study area, it was found growing on soil protected by rocks, exposed soil and soil associated with waterfowl nests. Gametophytes were found on the plateau, the slope and the coast. It was occasionally found growing alone, although usually it grew together with other bryophytes.	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE8FC83FEACFA3A1509.taxon	discussion	Comments Bryum argenteum is distinguished from other species of the genus by having small gametophytes, being silvery and julaceous in appearance and presenting hyaline apical cells (Sharp et al. 1994).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE8FC83FEACFA3A1509.taxon	materials_examined	Examined material: Antarctica, Marambio Island, going down to the east from the Casa de Emergencia (64 ° 14 ′ 23.73 ′′ S; 56 ° 37 ′ 10.34 ′′ W; 185 m. a. s. l.), on soil protected by rocks, 12.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5661); ibid., descending from the plateau towards Caleta Larsen (64 ° 13 ′ 53.8 ′′ S; 56 ° 36 ′ 27.97 ′′ W; 84 m. a. s. l.), on unprotected ground, 15.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5671); ibid., descending from the plateau towards the west coast from Las Cruces (64 ° 13 ′ 50.70 ′′ S; 56 ° 36 ′ 21.17 ′′ W; 180 m. a. s. l.), on soil protected by rocks, 16.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5677); ibid., descending from the plateau towards the west coast, Streamlet La Tradición (64 ° 13 ′ 57.18 ′′ S; 56 ° 37 ′ 41.34 ′′ W; 26 m. a. s. l.), on unprotected ground, 17.1.2022, A. C. Cottet (BCRU 5690); ibid., descending from the plateau towards the west coast by stream from the end of the track (64 ° 14 ′ 18.82 ′′ S; 56 ° 38 ′ 58.06 ′′ W; 120 m. a. s. l.), on unprotected ground, 19.1.2022, A. C. Cottet (BCRU 5692); ibid., Streamlet La Tradición (64 ° 13 ′ 46.85 ′′ S; 56 ° 39 ′ 13.96 ′′ W; 3 m. a. s. l.), on soil protected by rocks, 19.1.2022, A. C. Cottet (BCRU 5702); ibid., on the plateau on the way to La Remota (64 ° 14 ′ 48.62 ′′ S; 56 ° 38 ′ 16.22 ′′ W; 191 m. a. s. l.), on soil protected by rocks, 21.1.2022, A. C. Cottet (BCRU 5711); ibid., east coast, stream prior to La Pingüinera area (64 ° 17 ′ 31.56 ′′ S; 56 ° 41 ′ 43.62 ′′ W; 8 m. a. s. l.), on unprotected soil, 21.1.2022, A. C. Cottet (BCRU 5715); ibid., seagull nest area (64 ° 17 ′ 20.90 ′′ S; 56 ° 41 ′ 27.74 ′′ W; 9 m. a. s. l.), on soil protected by rocks surrounding the seagull nest, 21.1.2022, A. C. Cottet (BCRU 5722); ibid., west coast, near Casa de Botes, streamlet area to the north (64 ° 15 ′ 33.37 ′′ S; 56 ° 43 ′ 53.08 ′′ W; 13 m. a. s. l.), on unprotected soil, 29.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5733).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE8FC83FC2BFA9410E1.taxon	description	Description and iconography Ochyra et al. (2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE8FC83FC2BFA9410E1.taxon	distribution	Distribution and habitat This species is a bipolar moss with intermediate occurrences at high elevations. In Antarctica, it is considered to be frequent and widely distributed. Bryum pseudotriquetrum grows in a great diversity of both exposed and protected habitats. It is a common species in places with thaw runoff, growing between rocky mounds (Ochyra et al. 2008). This species was found growing on soil protected by rocks, exposed soil and soil associated with waterfowl nests. Gametophytes of the species were found on the plateau, the slope and the coast. In relative terms, this species, together with A. brevirostris, was found more frequently and formed larger patches, reaching 20 m 2. It was observed growing alone or with other bryophytes.	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE8FC83FC2BFA9410E1.taxon	discussion	Comments This species is characterized by broad, long decurrent leaves, short excurrent costa, small distal lamina cells and red basal leaves. In the climatic conditions of Antarctica, the species presents great phenotypic variations; thus, the specimens of this species were often confused with other species (Ochyra et al. 2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE8FC83FC2BFA9410E1.taxon	materials_examined	Examined material: Antarctica, Marambio Island, going down to the east from the Emergency House (64 ° 14 ′ 23.92 ′′ S; 56 ° 37 ′ 11.55 ′′ W; 184 m. a. s. l.), on soil protected by rocks, 12.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5660); ibid., descending from the plateau towards Caleta Larsen (64 ° 13 ′ 53.8 ′′ S; 56 ° 36 ′ 27.97 ′′ W; 84 m. a. s. l.), on unprotected ground, 15.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5671); ibid., descending from the plateau towards the west coast from Las Cruces (64 ° 13 ′ 50.70 ′′ S; 56 ° 36 ′ 21.17 ′′ W; 180 m. a. s. l.), on soil protected by rocks, 16.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5678); ibid., descending from the plateau towards the west coast from the Very-High-Frequency Omnidirectional Range towards Streamlet La Tradición (64 ° 14 ′ 03.28 ′′ S; 56 ° 37 ′ 14.70 ′′ W; 181 m. a. s. l.), on soil protected by rocks, 17.1.2022, A. C. Cottet (BCRU 5682); ibid., Streamlet La Tradición (64 ° 13 ′ 49.51 ′′ S; 56 ° 37 ′ 55.67 ′′ W; 26 m. a. s. l.), on unprotected soil, 17.1.2022, A. C. Cottet (BCRU 5685); ibid., descending from the plateau towards the west coast by stream from the end of the track (64 ° 14 ′ 18.82 ′′ S; 56 ° 38 ′ 58.06 ′′ W; 120 m. a. s. l.), on unprotected ground, 19.1.2022, A. C. Cottet (BCRU 5692); ibid., Streamlet La Tradición (64 ° 13 ′ 46.85 ′′ S; 56 ° 39 ′ 19.76 ′′ W; 4 m. a. s. l ..), on soil protected by rocks, 19.1.2022, A. C. Cottet (BCRU 5701); ibid., East coast, stream prior to La Pingüinera area (64 ° 17 ′ 35.52 ′′ S; 56 ° 41 ′ 41.24 ′′ W; 14 m. a. s. l.), on unprotected soil, 21.1.2022, A. C. Cottet (BCRU 5712); ibid., west coast, near Casa de Botes, streamlet area to the north (64 ° 15 ′ 39.60 ′′ S; 56 ° 43 ′ 57.97 ′′ W; 15 m. a. s. l.), on unprotected soil, 29.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5731); ibid., streamlet mouth zone (64 ° 15 ′ 23.35 ′′ S; 56 ° 44 ′ 45.90 ′′ W; 2 m. a. s. l.), on unprotected soil, 30.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5742).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE9FC83F903FE6F1471.taxon	description	Description and iconography Ochyra et al. (2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE9FC83F903FE6F1471.taxon	distribution	Distribution and habitat It is considered a cosmopolitan moss; however, in tropical areas, it is restricted to elevated areas. In Antarctica, the species is, like B. pseudotriquetrum, pan-Antarctic. It has a large ecological distribution and occurs in open and protected areas (Ochyra et al. 2008). In the study area, it was found growing on the ground in both protected and exposed sites and across the three regions of the island: plateau, slope and coast, growing alone or with other bryophytes.	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE9FC83F903FE6F1471.taxon	discussion	Comments The gametophytes of C. purpureus can be confused with those of species included in the family Pottiaceae. However, this species is characterized by having strongly recurved or revolute leaf margins, irregularity of the edge towards the apex, absence of papillae and cells of the apical portion of the lamina being subquadrate to rounded (Ochyra et al. 2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94255FFE9FC83F903FE6F1471.taxon	materials_examined	Examined material: Antarctica, Marambio Island, plateau of the island, behind the Plant (64 ° 14 ′ 32.21 ′′ S; 56 ° 37 ′ 36.69 ′′ W; 197 m. a. s. l.), on unprotected ground, 9.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5659); ibid., going down to the east from the Emergency House (64 ° 14 ′ 23.92 ′′ S; 56 ° 37 ′ 11.55 ′′ W; 184 m. a. s. l.), on soil protected by rocks, 12.1.2022, B. C. Cottet and L. P. Dopchiz (BCRU 5660); ibid., going down to the east from La Chacarita (64 ° 14 ′ 27.29 ′′ S; 56 ° 37 ′ 20.42 ′′ W; 180 m. a. s. l.), on unprotected soil, 13.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5664); ibid., descending from the plateau towards the west coast from the Very-High-Frequency Omnidirectional Range towards Streamlet La Tradición (64 ° 13 ′ 57.18 ′′ S; 56 ° 37 ′ 41.34 ′′ W; 26 m. a. s. l.), on unprotected ground, 17.1.2022, A. C. Cottet (BCRU 5690); ibid., east coast, a rill prior to the La Pingüinera area, on the coast (64 ° 17 ′ 06.93 ′′ S; 56 ° 41 ′ 02.58 ′′ W; 4 m. a. s. l.), on soil protected by rocks, 21.1.2022, A. C. Cottet (BCRU 5727); ibid., west coast, near Casa de Botes, streamlet zone (64 ° 15 ′ 33.37 ′′ S; 56 ° 43 ′ 53.08 ′′ W; 10 m. a. s. l.), on unprotected soil, 29.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5735).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94254FFE9FFD9FDF9FF5B12A9.taxon	description	Description and iconography Ochyra et al. (2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94254FFE9FFD9FDF9FF5B12A9.taxon	distribution	Distribution and habitat Didymodon brachyphyllus has a bipolar distribution and is considered pan-Antarctic. This species occurs both in dry and humid habitats, often in sheltered sites such as crevices and rocky ledges (Ochyra et al. 2008). In the study area, it was found growing on the ground in the plateau and slope zones, mostly growing alone, but it was also encountered with other bryophytes.	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94254FFE9FFD9FDF9FF5B12A9.taxon	discussion	Comments Didymodon brachyphyllus can be confused with small gametophytes of B. antarcticum. However, the former is green to brown, with leaves 0.5 – 1.1 mm long, ovate to ovate-lanceolate, and often cuculate at the apex, the apical cells are never smooth, and the axillar hairs have brown basal cells and axillary buds, while the latter does not have these features (Ochyra & Zander 2002).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94254FFE9FFD9FDF9FF5B12A9.taxon	materials_examined	Examined material: Antarctica, Marambio Island, going down to the east from La Chacarita (64 ° 14 ′ 27.29 ′′ S; 56 ° 37 ′ 20.42 ′′ W; 180 m. a. s. l.), on unprotected soil, 13.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5667); ibid., going down to the east from La Chacarita (64 ° 14 ′ 49.33 ′′ S; 56 ° 37 ′ 18.80 ′′ W; 124 m. a. s. l.), on unprotected soil, 13.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5668); ibid., descending from the plateau towards the west coast from the Very-High-Frequency Omnidirectional Range towards Streamlet La Tradición (64 ° 14 ′ 03.62 ′′ S; 56 ° 37 ′ 12.47 ′′ W; 193 m. a. s. l.), on soil protected by rocks, 17.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5680); ibid., Streamlet La Tradición (64 ° 13 ′ 47.64 ′′ S; 56 ° 37 ′ 27.48 ′′ W; 26 m. a. s. l.), on unprotected soil, 17.1.2022, A. C. Cottet (BCRU 5684).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94254FFE9FFD9FAB0FD5F114A.taxon	description	Description and iconography Ochyra et al. (2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94254FFE9FFD9FAB0FD5F114A.taxon	distribution	Distribution and habitat Encalypta rhaptocarpa has a bipolar distribution. In Antarctica, it is more frequent in maritime regions (islands) and grows in exposed or protected sites, near streams or thaw cracks (Ochyra et al. 2008). It exclusively grows on the plateau in exposed soil, accompanied by other bryophytes.	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94254FFE9FFD9FAB0FD5F114A.taxon	discussion	Comments Identifying E. rhaptocarpa with mature sporophytes is not difficult if the capsules - the most distinctive features of the species - are prominently ribbed with straight ribs. However, when the plant is sterile, it can be confused with Encalypta procera; the absence of axillary propagules in E. rhaptocarpa allows us to distinguish between these two species (Ochyra et al. 2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94254FFE9FFD9FAB0FD5F114A.taxon	materials_examined	Examined material: Antarctica, Marambio Island, going down to the east from La Chacarita (64 ° 14 ′ 27.29 ′′ S; 56 ° 37 ′ 20.42 ′′ W; 180 m. a. s. l.), on unprotected soil, 13.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5666).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94254FFE9FFD9F8D3FAB514C0.taxon	description	Description and iconography Ochyra et al. (2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94254FFE9FFD9F8D3FAB514C0.taxon	distribution	Distribution and habitat A bipolar species, mostly occurring in dry habitats on rocks, boulders, ledges, rock crevices and occasionally on gravel and soil and less often found in wet habitats on rocks at the edge of late snow and on rocks used as bird perches (Ochyra et al. 2008). In the study area, it was found in the three regions of the island: plateau, slope and coast. It was found growing on soil and rock from bird nests, as well as soil and rock from sites far from nesting areas. It mostly grows alone or with other mosses.	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94254FFE9FFD9F8D3FAB514C0.taxon	discussion	Comments The gametophytes of this species are characterized by their concave-oval to oblong-oval leaves, with blunt apices with a slightly decurrent serrated hyaline hair that gives the plant a whitish appearance. In cross-section, the leaves are concave in the shape of a ’ u’ and never keeled (Ochyra et al. 2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94254FFE9FFD9F8D3FAB514C0.taxon	materials_examined	Examined material: Antarctica, Marambio Island, on the plateau in La Chacarita (64 ° 14 ′ 8.17 ′′ S; 56 ° 36 ′ 54.08 ′′ W; 190 m. a. s. l.), on unprotected soil, 13.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5669); ibid., descending from the plateau towards Caleta Larsen (64 ° 13 ′ 53.8 ′′ S; 56 ° 36 ′ 27.97 ′′ W; 84 m. a. s. l.), on unprotected ground, 15.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5670); ibid., descending from the plateau towards the west coast from Las Cruces (64 ° 13 ′ 50.70 ′′ S; 56 ° 36 ′ 21.17 ′′ W; 180 m. a. s. l.), on soil protected by rocks, 16.1.2022, A .. C. Cottet and L. P. Dopchiz (BCRU 5677); ibid., descending from the plateau towards the west coast by a stream from the end of the track (64 ° 14 ′ 16.73 ′′ S; 56 ° 38 ′ 59.136 ′′ W; 116 m. a. s. l.), on rock, 19.1.2022, A. C. Cottet (BCRU 5694); ibid., on the plateau on the way to La Remota (64 ° 14 ′ 48.62 ′′ S; 56 ° 38 ′ 16.22 ′′ W; 191 m. a. s. l.), on soil protected by rocks, 21.1.2022, A. C. Cottet (BCRU 5711); ibid., east coast, stream prior to La Pingüinera area (64 ° 17 ′ 35.52 ′′ S; 56 ° 41 ′ 41.24 ′′ W; 14 m. a. s. l.), on unprotected soil, 21.1.2022, A. C. Cottet (BCRU 5712); ibid., rill prior to the area of La Pingüinera (64 ° 17 ′ 20.90 ′′ S; 56 ° 41 ′ 27.74 ′′ W; 5 m. a. s. l.), on unprotected soil, 21.1.2022, A. C. Cottet (BCRU 5725); ibid., second descent from the plateau towards the east coast (64 ° 15 ′ 37.37 ′′ S; 56 ° 38 ′ 54.20 ′′ W; 119 m. a. s. l.), soil protected by rocks, 21.1.2022, A. C. Cottet (BCRU 5728); ibid., west coast, near Casa de Botes, streamlet zone to the north (64 ° 15 ′ 42.01 ′′ S; 56 ° 44 ′ 02.32 ′′ W; 21 m. a. s. l.), on unprotected soil, 29.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5729).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94254FFE9FC9AFD6CFB8B1337.taxon	description	Description and iconography Ochyra et al. (2008). Habitat and distribution	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94254FFE9FC9AFD6CFB8B1337.taxon	discussion	Comments Hennediella heimii is characterized by having leaves that are more or less toothed or serrated towards the apex, which can be acute or acuminate; leaf margins indistinctly edged and flat; apical lamellar cells that are densely papillose; and upper lamellar cells that are translucent (Ochyra et al. 2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94254FFE9FC9AFD6CFB8B1337.taxon	materials_examined	Examined material: Antarctica, Marambio Island, on the plateau in the Laboratorio Antártico Multidisciplinario Marambio (64 ° 14 ′ 28.94 ′′ S; 56 ° 37 ′ 18.32 ′′ W; 198 m. a. s. l.), on unprotected soil, 16.1.2022, A. C. Cottet and L. P. Dopchiz, A. C. Cottet (BCRU 5679); ibid., descending from the plateau towards the west coast from the Very-High-Frequency Omnidirectional Range towards Streamlet La Tradición (64 ° 13 ′ 57.18 ′′ S; 56 ° 37 ′ 41.34 ′′ W; 26 m. a. s. l.), on unprotected ground, 17.1.2022, A. C. Cottet (BCRU 5690); ibid., Streamlet La Tradición (64 ° 13 ′ 58.01 ′′ S; 56 ° 37 ′ 35.76 ′′ W; 53 m. a. s. l.), on unprotected soil, 17.1.2022, A. C. Cottet (BCRU 5691); ibid., streamlet La Tradición (64 ° 13 ′ 45.62 ′′ S; 56 ° 39 ′ 12.46 ′′ W; 3 m. a. s. l.), on unprotected soil, 19.1.2022, A. C. Cottet (BCRU 5703); ibid., on the plateau in La Chacarita next to transport (64 ° 14 ′ 32.26 ′′ S; 56 ° 37 ′ 25.32 ′′ W; 191 m. a. s. l.), on soil protected by rocks, 20.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5709).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94254FFEEFC9AFA3DFD33168C.taxon	description	Description and iconography Ochyra et al. (2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94254FFEEFC9AFA3DFD33168C.taxon	distribution	Distribution and habitat A bipolar species, with some intermediate occurrences, it can be found in dry or wet areas, sheltered or open sites, on clayey, sandy or rocky soil, gravel, humus or in rock crevices (Ochyra et al. 2008). In the study area, representatives of P. pallescens were found growing on soil in exposed sites. This species is found only in the coastal region of the island, growing alone or with other bryophytes.	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94254FFEEFC9AFA3DFD33168C.taxon	discussion	Comments This species, despite usually being sterile in Antarctica, is distinguished from its congeners by the twisting of its leaves into a spiral when dry. In addition, it has oblong lanceolate leaves with an excurrent costa on a long hair; and lamina cells are small rhomboid to oblong rhomboid cells, generally less than three times as long as they are wide (Ochyra et al. 2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94254FFEEFC9AFA3DFD33168C.taxon	materials_examined	Examined material: Antarctica, Marambio Island, Streamlet La Tradición (64 ° 13 ′ 45.04 ′′ S; 56 ° 38 ′ 58.84 ′′ W; 7 m. a. s. l.), on unprotected soil, 19.1.2022, A. C. Cottet (BCRU 5704); ibid., east coast, stream prior to La Pingüinera area (64 ° 17 ′ 20.90 ′′ S; 56 ° 41 ′ 27.74 ′′ W; 5 m. a. s. l.), on unprotected soil, 21.1.2022, A. C. Cottet (BCRU 5725).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94253FFEEFFC2FEA9FD9B157B.taxon	description	Description and iconography Ochyra et al. (2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94253FFEEFFC2FEA9FD9B157B.taxon	distribution	Distribution and habitat Endemic to Antarctica, S. antarctici is associated with rocky sites, both dry and wet and exposed or protected (Ochyra et al. 2008). Representatives of this species were found growing on soil in exposed sites in the study area, located only in the coastal region of the island.	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94253FFEEFFC2FEA9FD9B157B.taxon	discussion	Comments Sterile plants of this species are distinguished by having closely overlapping leaves in three to four rows, the costa is semi-terete and tristratose below, the leaf margin is bistratose and the leaves lack a hyaline basal margin (Ochyra et al. 2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94253FFEEFFC2FEA9FD9B157B.taxon	materials_examined	Examined material: Antarctica, Marambio Island, Streamlet La Tradición (64 ° 13 ′ 45.04 ′′ S; 56 ° 38 ′ 58.84 ′′ W; 7 m. a. s. l.), on rock, 19.1.2022, A. C. Cottet (BCRU 5705).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94253FFEEFFC2FCE6FE73138D.taxon	description	Description and iconography Ochyra et al. (2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94253FFEEFFC2FCE6FE73138D.taxon	distribution	Distribution and habitat A bipolar species, with some intermediated occurrences. Syntrichia caninervis var. caninervis grows on dry, fine, friable soil stabilized by mosses (Ochyra et al. 2008). In the coastal region of the island, representatives of S. caninervis var. caninervis were found growing on rock in exposed sites.	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94253FFEEFFC2FCE6FE73138D.taxon	discussion	Comments This species is similar to a common species in Antarctica, Syntrichia magellanica; however, it is distinguished from the latter by the presence of a hyaline hair on the leaf and a papillose dorsal surface of the costa. In addition, S. caninervis var. caninervis has recurved leaf margins and bifurcated, pedicelate papillae (Ochyra et al. 2008). Furthermore, this species is distinguished from S. caninervis var. gypsophila, a variety found in Antarctica, as it has irregularly bistratose laminal cells in the distal hairs of the leaves. Finally, the upper leaves are larger and have thinner walls (Ochyra et al. 2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94253FFEEFFC2FCE6FE73138D.taxon	materials_examined	Examined material: Antarctica, Marambio Island, east coast, rill prior to the area of La Pingüinera, area of seagull nests (64 ° 17 ′ 21.88 ′′ S; 56 ° 41 ′ 32.39 ′′ W; 9 m. a. s. l.), on rock surrounding the seagull nest, 21.1.2022, A. C. Cottet (BCRU 5718).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94253FFEEFFC2F9A8FB5C168C.taxon	description	Description and iconography Ochyra et al. (2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94253FFEEFFC2F9A8FB5C168C.taxon	distribution	Distribution and habitat This species is considered Antarctic / sub-Antarctic, growing in a wide variety of habitats, from dry to humid and from exposed to sheltered (Ochyra et al. 2008). Syntrichia magellanica was found growing in the studied area on exposed soil and rock at coastal and hillside sites, either alone or with other bryophytes.	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94253FFEEFFC2F9A8FB5C168C.taxon	discussion	Comments This species is distinguished from others of the genus by having an excurrent costa in a long, smooth hair, recurved lamina margins without edges, a smooth dorsal surface and no hydroids in cross-section (Gallego et al. 2011).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94253FFEEFFC2F9A8FB5C168C.taxon	materials_examined	Examined material: Antarctica, Marambio Island, descending from the plateau towards the west coast from the Very-High-Frequency Omnidirectional Range towards Streamlet La Tradición (64 ° 13 ′ 47.64 ′′ S; 56 ° 37 ′ 27.48 ′′ W; 26 m. a. s. l.), on unprotected ground, 17.1.2022, A. C. Cottet (BCRU 5684); ibid., east coast, rill prior to La Pingüinera area (64 ° 17 ′ 31.56 ′′ S; 56 ° 41 ′ 43.62 ′′ W; 8 m. a. s. l.), on rock, 21.1.2022, A. C. Cottet (BCRU 5714).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94253FFEEFC83FEACFA501534.taxon	description	Description and iconography Ochyra et al. (2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94253FFEEFC83FEACFA501534.taxon	distribution	Distribution and habitat This species is endemic to the continent and pan-Antarctic. Syntrichia sarconeurum grows in wet and dry habitats and on exposed and sheltered sites (Ochyra et al. 2008). In the study area, representatives of this species were found exclusively in the slope zone, growing on the ground in both exposed and rockprotected sites. It was found growing alone or with other species.	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94253FFEEFC83FEACFA501534.taxon	discussion	Comments Although S. sarconeurum is easily distinguished from most other Antarctic species, it is often confused with two closely related species: Tortella fragilis (Drumm.) Limpr. and Tortella alpicola Dixon. However, S. sarconeurum is characterized by having a single dorsal steroid band and a gradual differentiation between chlorophyll cells and basal hyaline cells (Ochyra et al. 2008).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
A22D87C94253FFEEFC83FEACFA501534.taxon	materials_examined	Examined material: Antarctica, Marambio Island, going down to the east from the Emergency House (64 ° 14 ′ 23.73 ′′ S; 56 ° 37 ′ 10.34 ′′ W; 185 m. a. s. l.), on soil protected by rocks, 12.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5661); ibid., going down to the east from La Chacarita (64 ° 14 ′ 49.33 ′′ S; 56 ° 37 ′ 18.80 ′′ W; 124 m. a. s. l.), on unprotected soil, 13.1.2022, A. C. Cottet and L. P. Dopchiz (BCRU 5668); ibid., descending from the plateau towards the west coast from the Very-High-Frequency Omnidirectional Range towards Streamlet La Tradición (64 ° 14 ′ 03.28 ′′ S; 56 ° 37 ′ 14.70 ′′ W; 181 m. a. s. l.), on soil protected by rocks, 17.1.2022, A. C. Cottet (BCRU 5683).	en	Cottet, Agustina Celeste, Messuti, María Inés, Ansaldo, Martín, Dopchiz, Laura Patricia (2025): Mosses (Bryophyta) of the north-western region of Marambio (Seymour) Island, Antarctica. Antarctic Science (Cambridge, England) 37 (1): 31-38, DOI: 10.1017/S0954102024000464, URL: https://doi.org/10.1017/s0954102024000464
