华东膜蕨 hua dong mo jue

Leptocionium barbatum Bosch, Ned. Kruidk. Arch. 5[3]: 416. 1863; Hymenophyllum denticulatum Swartz var. flaccidum (Bosch) C. B. Clarke; H. fastigiosum Christ; H. khasianum Baker; H. minutidenticulatum Ching & P. S. Chiu; H. okadai Masamune; H. omeiense Christ; H. oxyodon Baker; H. rufofibrillosum Ching & Z. Y. Liu; H. spicatum Christ; H. spinosum Ching; H. suprapaleaceum Ching; H. taiwanense De Vol (1975), not (Tagawa) C. V. Morton (1968); H. urofrons Ching & C. F. Zhang; H. whangshanense Ching & P. S. Chiu; L. flaccidum Bosch; Mecodium okadai (Masamune) Shieh.

Plants 1-15 cm tall. Rhizome brown to dark brown or reddish brown, 0.2-0.5 mm in diam., with sparse brownish hairs or subglabrous, with hairy roots. Stipes remote, 1-4 cm apart, dark brown or brown, filiform, 0.5-6 cm, wingless or narrowly winged at apex, with sparse reddish brown hairs. Rachis dark brown, winged throughout or at apex. Lamina 1-3-pinnate, ovate or oblong to lanceolate, 1.5-12 × 1-4 cm, membranous and semitransparent, glabrous, base subcordate or rounded-cuneate, apex obtuse; pinnae 3-12 pairs, slightly imbricate to neighboring ones, alternate, sessile, widely spreading, oblong to obovate or oblong-ovate, 0.5-2.5 cm × 3-11 mm; ultimate segments linear or oblong, 2-6 × 0.6-2 mm, with 1(or 2) veinlets, margin subentire to serrulate, apex obtuse. Veins dichotomous, dark brown, obviously raised on each surface. Sori on upper parts of frond, terminal on short segments; involucres ovate to oblong, 1.5-2 × ca. 1 mm, slightly serrate and obtuse or rounded at apex; receptacles usually included. 2n = 42.

On moss-covered tree trunks or on wet rocks in subtropical or tropical evergreen forests, near streams; 400-2300 m. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hunan, Jiangxi, Sichuan, Taiwan, Yunnan, Zhejiang [Himalaya, India, Japan (including Ryukyu Islands), Korea, Myanmar, Thailand, Vietnam].

Hymenophyllum barbatum is a widespread, very variable species, especially in the form and size of the fronds and shape of the involucres; thus, many names have been proposed.