8. Trachycystis Lindb. 疣灯藓属 you deng xian shu
Not. Sällsk. Fauna Fl. Fenn. Förh. 9: 80. 1868. Mnium sect. Trachycystis (Lindb.) Mitt., Trans. Linn. Soc. London, Bot. 3: 169. 1891. Mnium subgen. Trachycystis (Lindb.) P.-C. Chen ex X.-J. Li & M. Zang, Acta Bot. Yunnan. 1: 38. 1979.
Flagellomnium Laz., Bot. Žurn. (Kiev) 2(1): 62. 1941.
Plants small, medium-sized to rather large, slender, dark green to reddish brown, clustered in tufts. Stems erect, 2–5 cm high, upper stems often multi-branched, or with flagelliform branches; infertile stems attenuated toward apex; central strand well developed. Leaves crisped when dry, secund, lower leaves small, sparse; upper leaves larger, dense; stem and branch leaves more or less similar, ovate-lanceolate or oblong-elliptical, gradually acute; margins slightly or distinctly bordered by elongate cells, sharply serrate; costae thick, nearly percurrent, often with a single, double or multiple teeth at back, especially near the apex; leaf cells rounded-quadrate or rounded-hexagonal, papillose, mammillose or smooth. Dioicous. Perichaetial leaves not clearly differentiated. Sporophytes terminal. Setae elongate, stout; capsules cylindrical, horizontal to slightly pendulous; opercula conic, shortly rostrate, papillose; peristome double; exostome teeth reddish brown; endostome segments lanceolate, as long as the teeth, perforate; basal membrane ca. 1/2 the height of the teeth; cilia 3, nodulose. Calyptrae cucullate. Spores spherical.