Leptogium quilombensis C.M. Bernardo, Kitaura & A.A. Spielmann, 2019

Kitaura, Marcos J., Bernardo, Caique M., Koch, Natália M., Rodrigues, Andressa S., Torres, Jean-Marc, Barbosa, Thiago D., Canêz, Luciana Da S., Spielmann, Adriano A., Honda, Neli K., Fleig, Mariana & Lorenz, Aline P., 2019, Leptogium (Collemataceae, Peltigerales) from Mato Grosso do Sul state, Brazil: nine new records, three new taxa and a key for the species, Phytotaxa 399 (2), pp. 127-146 : 141-142

Leptogium quilombensis C.M. Bernardo, Kitaura & A.A. Spielmann , sp. nov. ( Figures 4B–4D )

Diagnosis: Similar to Leptogium javanicum , but the pedicel has irregular to longitudinal wrinkles with withered appearance.

Holotype:— BRAZIL. Mato Grosso do Sul: Jaraguari, Furnas do Dionísio , 20°09’00.5”S 54°34’28.2”W, 440 m elev., corticolous, 13 November 2015, C.M. Bernardo, T. D. Barbosa 814 ( CGMS).

MycoBank: 829955

Description: Thallus foliose, 7.0– 8.5 cm broad, gray to fluorescent light, opaque, matt to slightly bright, gray under stereomicroscope. Lobes 0.5–2.0 mm wide, agglomerated, attached in points, adpressed, upper surface smooth to naked eye, irregular to longitudinal slightly ridges under 20× magnification; apices rounded, ascending to revolute, smooth; lateral margins ascending, smooth, sinuous and undulated; lower side yellowish, ridged under 20× magnification. Isidia and lobules absent. Thallus attached by hapters, frequent, not originating cavities on the upper cortex. Rhizines and hairs absent. Apothecia 0.5–1.2 mm diam., submarginal, pedicellate, disc reddish, concave; margin beige to brownish, smooth or with intermittent wrinkles (concolorous with the thallus); amphithecia beige, smooth, usually covered by thallus (bullate structure with withered appearance); corona absent; pedicel 1.0–2.0 mm high, heavily wrinkled, irregular or slightly longitudinal. Anatomy: Thallus 75–125 μ m thick, cortices with isodiametric cells, 5.0 μ m diam.; medulla with columnar hyphae straight to inclined, 5–7 cells high, frequent; cyanobacteria green, 10–16 cells per filament, 2.5–5.0 μ m diam.; gelatinous matrix frequent, colorless. Apothecia with hymenium ca. 140 μ m high, subhymenium 35–40 μ m thick, colorless, hypothecium 35–40 μ m thick, prosoplectenchymatous cells, colorless; parahymenial tissue continuous with hypothecium elongated cells at the base and colloplectenchymatous cells at the apices; proper exciple absent; thalline exciple cortex composed by paraplectenchymatous tissue, 5.0–50.0 μ m (1–7 cells) thick at the apices, thin cortex when the wrinkle is present, 75–100 μ m (7–10 cells) thick at the mid-height, thallus inserted at the base of lateral apothecia; basal paraplectenchymatous tissue 125–150 μ m (7–10 cells) thick. Ascospores fusiform, 25.0–30.0 × 7.5–12.5 μ m, apices obtuse, submuriform to muriform. Pycnidia marginal, ostiole brown; conidia bifusiform 5.0–1.25 μ m.

Notes: Leptogium quilombensis is characterized by the agglomerated thallus, apothecia pedicellate and pedicel with irregular to longitudinal wrinkles with withered appearance.

The amphithecia are covered by pedicel that originate bullate structures with withered appearance.

Leptogium quilombensis has pedicellate apothecia and basal paraplectenchymatous tissue like L. javanicum , but the pedicel of L. javanicum is inflated and the apothecium ornamented by bullated structures, whereas the pedicel of L. quilombensis is not inflated and the apothecium covered by structures with withered appearance.

The specific epithet honors the “quilombos” settlements, which were founded by escaped slaves and highlight the resilience of these people. The locality of Furnas do Dionísio, where the type specimen was collected, was a former “quilombo”.

Distribution in Brazil: Described here as new and reported to the municipalities of Alcinópolis and Jaraguari.

Examined material: BRAZIL. Mato Grosso do Sul: Alcinópolis, Parque Estadual das Nascentes do Rio Taquari , trilha da cachoeira, 18°08’57.50”S, 53°24’18.81”W 476 m elev., 24 October 2017. S.M.L. Souza, L.C. Peinado, G.C. Andrella 120 ( CGMS 64750 ) ; Jaraguari, Furnas do Dionísio , 20°09’00.5”S 54°34’28.2”W, 440 m elev., corticolous, 13 November 2015. C.M. Bernardo, T. D. Barbosa 804 ; corticolous, 12 September 2015, M.J. Kitaura 2537 ( CGMS) ; 2538 (CGMS); 2550 (CGMS); 2551 (CGMS).

Figures

FIGURE 4. A–D. Leptogium species. A. L. phyllocarpum (SML Souza 93). B–D. L. quilombensis (CM Bernardo 814, holotype). B. Detail of the thallus. C. Transversal section of the thallus, arrow = columnar hyphae. D. Transversal section of the apothecia, arrow = basal paraplectenchymatous tissue. Bars: 2 mm (A–B); 100 μm (C–D).