6. Cyrto-hypnum minusculum (Mitt.) Buck & Crum 糙柄细羽藓 cao-bing xi-yu xian
Contr. Univ. Michigan Herb. 17: 66. 1990. Thuidium minusculum (Mitt.) Jaeg., Ber. Thätigk. St. Gallischen Naturwiss. Ges. 1876–77: 256. 1878. Leskea minuscula Mitt., J. Linn. Soc., Bot., Suppl. 1: 134. 1859. Syntypes. India: Khasia, J. D. Hooker & T. Thomson 1071, 1072, 1092.
Thuidium asperulisetum Ren. & Card., Bull. Soc. Roy. Bot. Belgique 38(1) 32. 1900.
Plants slender, yellowish green to brownish green, in densely interwoven mats. Stems creeping, irregularly pinnately branched, rarely bipinnately branched; branches usually flexuous, ca. 3 mm long; central strand differentiated, rarely absent; paraphyllia densely growing on stems, filamentous, 1–5 cells long, apical cells acute; pseudoparaphyllia foliose, at the base of branches. Stem leaves remote, widely cordate, squarrose above, with acute or short obtuse apex; margins undulate, serrulate, revolute at base; costa rather wide, ending below leaf apex; branches widely ovate, slightly concave, apex widely obtuse; margins serrate; costa vanishing 5–9 cells below leaf apex; leaf cells rectangular to hexagonal, 7–10 µm wide, unipapillose on both sides, walls equally thickened. Autoicous. Female inflorescences on main branches. Perichaetial leaves suddenly narrowed from an oblong-ovate base to a long lanceolate apex, serrate above. Setae erect, 1.5–2.0 cm long, flexuous, coarse above, smooth below; capsules cylindrical, inclined to horizontal; peristome teeth Hypnum-type; endostome segments nearly as long as exostome teeth; basal membrane moderately high; cilia 2. Spores not seen.