5. Claopodium (Lesq. & Jam.) Ren. & Card. 麻羽藓属 ma-yu xian shu
Rev. Bryol. 20: 16. 1893. Hypnum subg. Claopodium Lesq. & Jam., Man. Mosses N. America 317, 327. 1884.
Plants small to medium-sized, sometimes delicate light green or yellowish green, brownish green when old, not shining, forming lax interwoven mats. Stems creeping or ascending, pinnately or irregularly branched, smooth or rarely papillose; central strand absent; paraphyllia mostly lacking. Stem leaves and branch leaves slightly to clearly differentiated; stem leaves loosely arranged, usually circinate when dry; ascending when moist, prolonged into a lanceolate or filiform acumen from an ovate or triangularly ovate base, rarely flexuous; leaf margins erect or slightly involute, serrate or serrulate; costa rigid, excurrent or vanishing below leaf apex, smooth or papillose on back; leaf cells rhomboidal, hexagonal or oblong ovate, opaque, unipapillose or finely multipapillose; marginal cells rather long and smooth; basal cells long and hyaline; branch leaves rather small, short, rarely revolute or flexuous above. Dioicous. Inner perichaetial leaves ovate-lanceolate prolonged into a narrow acumen. Setae slender, smooth or roughened; capsules oblong ovoid, brown, inclined to pendulous; annuli differentiated; opercula conic with beaks; peristome double; exostome teeth lightly yellow, bordered, striate and trabeculate; endostome smooth or finely papillose, the segments as long as the teeth, lanceolate, keeled; cilia 2–3, nodulose. Calyptrae cucullate, aciliate.