1. Brachymenium acuminatum Harv. in Hook. 尖叶短月藓 jian ye duan yue xian
Icon. Pl. Rar. 1: 19. 1836. Gemmabryum acuminatum (Harv. in Hook.) Spence & Ramsay, Phytologia 87: 65. 2005. Type: East Indies, Harvey s.n.
Plants small, to 5 mm high, grayish green to yellowish green, in dense tufts. Stems short, erect or nearly so, with numerous innovated branches and rhizoids at base. Leaves dense, in multiple rows, imbricately appressed, ovate-lanceolate, keeled, ca. 1.0 mm × 0.5 mm; margins plane, entire or serrulate in the upper part; costae strong, excurrent into long awns; leaf cells thin-walled; alar cells distinctly differentiated, quadrate or shortly rectangular, gradually becoming rhomboidal upwards; apical cells vermicular, thick-walled. Dioicous. Perichaetial leaves triangularly lanceolate, larger than the branch leaves. Setae erect, 8–20 mm long; capsules erect or slightly inclined, pyriform or ovoid; neck short; mouth narrowed; opercula conic, shortly apiculate; endostome segments rudimentary, basal membrane ca. 1/2 the height of teeth; cilia rudimentary or absent. Spores 11–17 µm in diameter.