Angiopteris nodosipetiolata Ting Wang tris, H . F. Chen & Y . H . Yan, 2024

Wang, Ting, Yang, Tuo, Zhang, Jin-Guo, Zhang, Gui-Liang, Yao, Shi-Wei, Xiang, Jian-Ying, Yan, Yue-Hong & Chen, Hong-Feng, 2024, Angiopteris nodosipetiolata (Marattiaceae), a new fern species from Yunnan, China, PhytoKeys 241, pp. 177-189 : 177-189

publication ID	https://doi.org/ 10.3897/phytokeys.241.115175
DOI	https://doi.org/10.5281/zenodo.11095664
persistent identifier	https://treatment.plazi.org/id/C615EC3A-B779-5E4D-8ED5-FC47F4AC8103
treatment provided by	PhytoKeys by Pensoft
scientific name	Angiopteris nodosipetiolata Ting Wang tris, H . F. Chen & Y . H . Yan
status	sp. nov.

Treatment

Angiopteris nodosipetiolata Ting Wang tris, H. F. Chen & Y. H. Yan sp. nov.

Figs 3 View Figure 3 , 4 View Figure 4

Holotype.

China. Yunnan: Maguan County, Gulinqing Village , ca. 1400 m elev., 26 Aug 2022, Ting Wang, YYH 16537 (holotype: IBSC [1010884!]).

Diagnosis.

Angiopteris nodosipetiolata is morphologically quite similar to A. chingii J. M. Camus in terms of having more than one naked pulvinus on the stipe and numerous joint-like hairs on the undersides of the mature pinnae. However, the former’s pinnae are lanceolate, occurring in 4–6 pairs, in contrast with the elliptical pinnae of the latter, which consist of only 2–3 pairs. Judging from the shape of laminae, A. nodosipetiolata also closely resembles A. latipinna (Ching) Z. R. He, W. M. Chu & Christenh. and A. subrotundata (Ching) Z. R. He & Christenh. Nonetheless , these two species exhibit only one naked pulvinus on the stipe and the surfaces of their mature pinnae, apart from the mid-rib, are smooth and hairless (Table 3 View Table 3 ). The phylogenetic and genetic distance analysis also showed that A. nodosipetiolata is not the closest relative of A. latipinna , A. subrotundata or A. chingii (Figs 1 View Figure 1 , 2 View Figure 2 ).

Description.

Plants terrestrial, 70–120 cm tall. Rhizomes long creeping. Stipes 40–70 cm long, 0.7–1.5 cm in diam., with 2–3 naked pulvini (occasionally with 1); stipe scales peltate, brown, lanceolate, margins with hair-like outgrowths, apex acuminate, cells clathrate and elongate. Laminae 35–50 × 25–30 cm; once pinnate, pinnae 4–6 pairs, lanceolate, ca. 15–20 × 3.5–4.5 cm, bases round-cuneate, margins coarsely dentate, apices caudate, densely covered with jointed hairs on the undersides of the mature pinnae. Veins free, simple or bifurcate, false veins absent. Sori medial, yet closer to the main vein, ranging in length from ca. 0.5 cm on the basal pinnae to ca. 1.8 cm in the middle pinnae. Exospores with forked rod-like ornamentation.

Additional specimens examined

(paratypes; all have the same locality as the holotype): CHINA. Yunnan: Maguan County, Gulinqing Village , ca. 1400 m elev., 27 Sept 2023, Gui-Liang Zhang, GLZ- 2023001 (CSH!), GLZ- 2023002 (IBSC [ 1010885 !]) ; CHINA. Yunnan: Maguan County , Gulinqing Village , ca. 1400 m elev., 17 July 2023, Ting Wang, GLQ- 1 ( SWFU!), GLQ- 2 (CSH!) .

Geographical distribution.

Currently, Angiopteris nodosipetiolata is only found in Gulinqing Nature Reserve of Yunnan Province based on our current knowledge and may represent a species endemic to Yunnan, China.

Ecology.

Angiopteris nodosipetiolata is observed at the edge of montane forests, growing at an elevation of approximately 1400 m.

Etymology.

The species exhibits 2–3 naked pulvini (nodos-) on the stipe (- petiolata).

Vernacular name.

瘤柄观音座莲 (liu bing guan yin zuo lian).

Conservation status.

There are ca. 500 mature individuals of Angiopteris nodosipetiolata has been found at the type locality and it thrives in forest edge areas that are susceptible to human disturbance. The status of the new species should be classified as Endangered ( EN), based on current information and following the International Union for Conservation of Nature and Natural Resources guidelines. In addition, it should be listed and protected as second grade Wild Plants Under State Protection like all other taxa in Angiopteris .