4. Pilotrichopsis Besch. 毛枝藓属 mao zhi xian shu
J. Bot. (Morot) 13: 38. 1899.
Plants dark green, yellowish brown to dark brown, stiff, thick or slenderly elongate, often in large patches on tree trunks. Stems sparsely pinnately or irregularly pinnately branched, with branchlets often slender and attenuate. Leaves appressed when dry, erect-spreading when moist, ovate-lanceolate, slightly decurrent at the base; margins somewhat recurved near the base, dentate above; costae single, ending in leaf apex, smooth; leaf cells elongate-elliptical, thick-walled; basal juxtacostal cells linear-rectangular; alar cells differentiated, in a group of oblate-rectangular cells, smooth. Autoicous. Setae very short; capsules immersed, oblong-ovoid, smooth; opercula conic; annuli differentiated; peristome double, erect, pale yellow; exostome teeth lanceolate, cross-striolate at the base, papillose above; endostome segments linear; cilia absent. Calyptrae cucullate, sparsely hairy. Spores spherical, minutely papillose.