7. Levierella C. Müll. 白翼藓属 bai-yi xian shu
Boll. Soc. Bot. Ital. 1897: 73. 1897.
Plants slender, delicate, green, yellowish green when old, not glossy or weakly glossy, in loose patches. Main stems prostrate, loosely foliate; rhizoids brownish, in bundle; irregularly branched, branches caespitose, apex obtuse, curved when dry. Leaves erect-spreading, broadly lanceolate to ovate-lanceolate, shortly acuminate at apex; leaf margins plane, serrulate above; costa single, ending in the middle of leaf; leaf cells elliptic or oblong-rhomboidal; alar cells quadrate, in several rows. Autoicous. Female inflorescences caespitose. Perichaetial leaves erect, light green, sheathing at base, tapering to a lanceolate apex. Setae slender, erect, yellowish; capsules erect, shortly cylindrical, yellowish brown, apophysis short; opercula conic-rostrate, with a short beak; annuli wide, deciduous when mature; peristome appearing single; exostome teeth lanceolate, yellow, smooth, inserted deeply in the mouth, with zig-zag median line, lamellae remote; endostome absent; cilia none. Calyptrae not seen. Spores tiny.