17. Sematophyllum Mitt. 锦藓属 jin xian shu
J. Linn. Soc., Bot. 8: 5. 1864. Hypnum sect. Sematophyllum (Mitt.) Ångstr., Öfvers. Förh. Kongl. Svenska Vetensk.-Akad. 30(5): 149. 1873.
Plants slender or robust, glossy, often in interwoven patches. Stems prostrate, irregularly or pinnately branched; rhizoids usually present. Leaves patent-spreading, sometimes slightly secund, ovate, oblong-ovate, or ovate-lanceolate, slightly concave, acute, acuminate or constricted into a filiform acumen, sometimes obtuse with short points; costae weak or absent; leaf cells narrowly rhomboidal, sometimes rhomboidal or oblong-oval, smooth; alar region clearly differentiated, consisting of elongate-inflated cells. Autoicous, rarely dioicous. Inner perichaetial leaves elongate, filiform at apex. Setae elongate, reddish, smooth; capsules erect or horizontal, ovoid or oblong-ovoid; opercula conic at base, very slenderly rostrate at apex; peristome double; exostome teeth narrowly lanceolate, outer surface cross-striate, inner surface trabeculate; endostome segments as high as the exostome teeth, keeled along median line, yellowish; basal membrane high; cilia 1–2, sometimes reduced. Spores irregularly globose, green or yellowish, smooth or nearly so.