Crepidomanes shenzhenense Wang Hui & X. Yun Wang, 2020

Wang, Hui, Zhao, Guo-Hua, Ravi, Baskaran Xavier & Lu, Shu-Gang, 2020, Crepidomanes shenzhenense (subg. Crepidomanes; Hymenophyllaceae), a new filmy fern species from Guangdong, southern China, Phytotaxa 440 (2), pp. 101-107 : 102-104

publication ID	https://doi.org/ 10.11646/phytotaxa.440.2.2
DOI	https://doi.org/10.5281/zenodo.14205416
persistent identifier	https://treatment.plazi.org/id/039187CD-FF9F-FFC5-FF73-FE48FE4BFB32
treatment provided by	Felipe
scientific name	Crepidomanes shenzhenense Wang Hui & X. Yun Wang
status	sp. nov.

Treatment

Crepidomanes shenzhenense Wang Hui & X. Yun Wang View in CoL , sp. nov. ( Figs. 1 View FIGURE 1 & 2 View FIGURE 2 ).

Type: — CHINA. Guangdong Province: Shenzhen City, Mt. Yangtaishan , 22°39’7” –26” N, 113°57’16”–24” E, elev. ca. 530 m, well shaded evergreen forest, on granitic rock, by stream in humid, 7 January 2017, Zhao Guo-hua, Wang Xiao-yun & Xu Ting 1701006 (holotype SZG-00109026 ! ; isotypes KUN!, MO!, PE!, SZG00109002 !, SZG00109027 !, SZG00109028 ! ).

Diagnosis: — Crepidomanes shenzhenense resembles C. latealatum ( van den Bosch 1863: 138) Copeland (1938: 60) but differs from the latter in having broadly obovate (vs. ovate to oblong or triangular) lamina, 1–4 (vs. 5–12) pairs of pinnae, involucre lips margin crenate to dissected (vs. entire), and sori only borne on the long acroscopic (vs. short acroscopic) segment.

Description: —Plants epilithic, 1–1.5 cm tall. Rhizome long creeping, irregularly branching, 0.4–0.6 mm in diam., densely covered with brown to dark brown short simple hairs. Fronds scattered on rhizome, 1–1.5 cm long, up to 1 cm broad; Stipe ca. 0.5 cm long, base with hairs like on rhizome, winged only at apex; lamina broadly obovate, sometimes obovate or elliptic, 1-pinnate to tri-pinnatifid, membranous, base equally cuneate, apex round, green to dark green, rachis green, winged throughout, slightly zigzag, glabrous; pinnae 1–4 pairs, closely spaced to slightly imbricate to neighboring one, alternate, sessile, base pinnae obovate, 5–7 mm long, 2.5–3 mm broad, upper pinnae linear, 2–3 mm long, ca. 1 mm broad; ultimate segments usually apart, linear, ca. 3 mm long and 1.5 mm broad, margin entire or slightly wavy, apex retused. Veins dichotomous, raised on each surface, green, sparsely covered with club-shaped hairs; submarginal false veinlets absent, internal false veinlets many, oblique, 0.5–0.8 mm long. Sori 1–5 on upper parts of frond, apical on pinnae or long acroscopic segment, involucres funnel form, elliptic, 1.5–1.8 mm long, ca. 0.8 mm wide, winged, lobed to 1/2, lips bilabiate, triangular, margin crenate to dissected; receptacles projecting, brown, 2–3 mm. Ca. 32 spores in each sporangium.

Geographical distribution: — Crepidomanes shenzhenense is known only from two localities, Mt.Yangtaishan and Mt. Wutongshan, Shenzhen City, Guangdong, southern China, based on our fieldwork and herbarium investigations.

Ecology: —Epilithic on wet granitic rock and cliff, near mountain stream in humid, under well shaded evergreen forest.

IUCN Red List category: —Hitherto, only two independent populations are known—the type locality in Mt. Yangtaishan Forest Park and the other in Mt. Wutongshan National Forest Park. The former population was observed to comprise about 300 individuals and the latter one about 50 (clones of the same individual excluded). These two populations are about 30 kilometers apart and their habitats are preserved by the forest park management. However, both of the two populations are close to hiking trails and threatened by human activities like trampling. Due to these limited populations at present situation, the current status of C. shenzhenense should be treated as EN—Endangered based on the International Union for Conservation of Nature Red List Categories and Criteria C2aii ( IUCN Standards and Petitions Subcommittee 2017).

Etymology: —The specific epithet is from Shenzhen, a city located in southern China, where the new species was discovered.

Additional specimens examined: — CHINA. Guangdong Province: Shenzhen City, Mt. Wutongshan , 22°34’05”– 19” N, 114°13’03”–17” E, elev. ca. 250 m, in well shaded evergreen forest, on cliff by a waterfall, 16 March 2018 Wang Xiao-yun 1803006 ( SZG) .