2. Claopodium assurgens (Sull. & Lesq.) Card. 大麻羽藓 da ma-yu xian
Bull. Soc. Bot. Genève, ser. 2, 3: 283. 1911. Hypnum assurgens Sull. & Lesq., Proc. Amer. Acad. Arts Sci. 4: 279. 1859. Type. Japan: Kagoshima Pref., Wright s.n.
Claopodium assurgens (Sull. & Lesq.) Card. var. attenuatum Nog., J. Jap. Bot. 14 : 29. 1938. Type. China: Taiwan, Suzuki s.n.
Claopodium crispulum (Bosch & Sande Lac.) Broth., Nat. Pflanzenfam. I(3): 1009. 1908. Pseudoleskea crispula Bosch & Sande Lac., Bryol. Jav. 2: 125, tab. 228. 1865.
Plants rather large, soft, yellowish green to olive green, brownish green when old, in loose interwoven mats. Stems up to 5 cm long, often irregularly pinnately branched; branches 5–8 mm long; central strand differentiated; paraphyllia absent. Stem leaves different from the branch leaves; stem leaves mostly crisped when dry, erect-spreading when moist, ovate to ovate-triangular from a wide base toward a narrow acumen; leaf margins serrate, revolute above the leaf middle; costa percurrent or slightly excurrent, smooth on back; median leaf cells oval to rounded quadrate, 6–12 µm × 5–6 µm, grossly papillose; apical leaf cells oblong-ovate to oblong rhomboidal; branch leaves about 1/2 the stem leaf length. Dioicous. Dwarf male plants growing on the leaves of female plants. Perichaetial leaves narrowly elongate-lanceolate, suddenly narrowed into a setulose apex, margins serrate above; costa weak and short. Setae reddish brown, about 1.0–1.5 cm long, minutely papillose; capsules cylindrical; opercula long beaked; peristome double; exostome teeth lanceolate, striate at lower portion, finely papillose above; endostome segments nearly as long as the exostome teeth; basal membrane about 2/5 the height of segments; cilia mostly 2. Spores ca. 12–17 µm in diameter, finely papillose.