27. Vesicularia (C. Müll.) C. Müll. 明叶藓属 ming ye xian shu
Bot. Jahrb. Syst. 23: 330. 1896. Hypnum sect. Vesicularia (C. Müll.) Hampe, Flora 50: 75. 1867. Hypnum subsect. Vesicularia C. Müll., Syn. Musc. Frond. 2: 233. 1851.
Plants slender or somewhat robust, pale green or dark green, in flattened mats. Stems prostrate, somewhat radiculose, simple or regularly branched, rarely pinnately branched, branches usually short, flattened, ascending; in stem cross section outer cortical cells smaller, not particularly thick-walled, medullar cells lax, thin-walled; central strand not developed. Leaves dense, more or less differentiated into dorsal, ventral, and lateral leaves, lateral leaves secund, rarely falcate, not decurrent at base, broadly ovate or oblong to ovate-lanceolate, acute or shortly to long-acuminate or filiform at apex; margins entire or only serrulate near apex; costae double, short or absent; leaf cells lax, rounded rhombic, hexagonal or nearly so, smooth, somewhat bordered, differentiated by a row of elongate cells; alar cells not differentiated; dorsal and ventral leaves smaller. Autoicous. Inner perichaetial leaves erect, slenderly acuminate. Setae elongate, smooth; capsules horizontal to inclined, ovoid, oblong-ovoid or obovoid, constricted below the mouth when dry; opercula conic, sometimes shortly rostrate; annuli developed; peristome double; exostome teeth narrowly lanceolate, yellowish brown, cross-striate on outer surface, trabeculate on inner surface; endostome segments perforate, smooth or papillose, cilia 1–3, shorter than the teeth, smooth. Calyptrae cucullate. Spores spherical, smooth.