12. Pelekium Mitt. 鹤嘴藓属 he-zui xian shu
J. Linn. Soc., Bot. 10: 176. 1868.
Plants slender, yellowish green or green, brownish when old, in loosely interwoven patches. Stems prostrate, up to 5 cm long, regularly bipinnately branched; central strand present; paraphyllia abundant, filamentous or foliose, simple, rarely branched. Stem leaves and branch leaves differentiated; stem leaves gradually forming lanceolate acumen from a widely ovate to triangularly ovate base, erect-spreading when moist, appressed when dry, up to 1 mm long; branch leaves irregularly arranged in 2 rows, concave, ovate or ovate-triangular; margins serrate; costa ending at the upper portion of leaves; leaf cells uni- to multipapillose. Dioicous or autoicous. Perichaetial leaves ovate-lanceolate or lanceolate, suddenly narrowed to a slender apex; margins serrate. Setae slender, yellowish brown or reddish brown; capsules cylindrical, horizontal or declined; opercula long beaked; exostome teeth 16, lanceolate, papillose in upper portion; endostome segments slender, finely papillose; basal membrane high or low; cilia usually 2. Calyptrae campanulate, hairy, lobed at base. Spores spherical.