5. Clastobryum Dozy & Molk. 疣胞藓属 you bao xian shu
Musci Frond. Ined. Archip. Ind. 2: 41. 1846.
Plants slender or slightly robust, soft, yellowish green, rarely red, or reddish brown, usually glossy. Stems slender and long, prostrate, rhizoids in mats; irregularly and densely pinnately branched, sometimes with narrowly flagellate branchlets. Branches short or long, erect or ascending, rarely pendent, round, or sometimes complanate with leaves appressed. Leaves loose or somewhat dense, narrowly ovate, concave, not plicate, shortly acuminate or ovate-lanceolate, acuminate; costae absent; leaf cells narrowly elongated; alar cells slightly inflated, thick-walled, reddish brown. Propagula present on branch axils, with large papillae. Autoicous. Inner perichaetial leaves lanceolate with long filiform acumen. Setae slender, twist, reddish brown; capsules erect, elongated ovate-round; opercula curved and shortly rostrate; annulus none; peristome double; exostome teeth reflexed when dry, lanceolate, smooth, low trabeculate on inner surface; endostome segments patent on the mouth of capsule; basal membrane low; cilia short, irregular. Spores irregular in shape, variable in size, densely papillose.