叉脉单叶假脉蕨 cha mai dan ye jia mai jue

Microgonium bimarginatum Bosch, Hymenophyll. Javan. 7. 1861; Trichomanes bimarginatum (Bosch) Bosch.

Plants 2-3 cm tall. Rhizome densely covered with dark brown multicellular hairs. Stipes 3-4 mm apart, 2-5 mm, densely hairy. Lamina oblong, oblong-ovate, or obovate, ca. 2 cm × 3-5 mm, membranous, glabrous, base cuneate, margin entire or ± crisped, apex rounded to obtuse. Veins pinnate, simple or forked, to margin of lamina; oblique false veinlets many, long, marginal ones continuous with a single row of marginal cells outside strand, joining ends of oblique ones. Sori 1-3 on apical part of frond, terminal on lateral veins; involucres tubular with dilated mouth, with expanded wings, somewhat bilabiate; receptacles projecting. 2n = 136.

On moss-covered rocks or moss-covered tree trunks; 400-600 m. C, ?N, and SE Taiwan [S India, Japan (Ryukyu Islands), Malesia, Sri Lanka, Thailand; Australia, Pacific islands (Melanesia, Micronesia, Samoa)].