1. Leucomium strumosum(Hornsch.) Mitt. 白藓 Bai xian
J. Linn. Soc. Bot. 12: 502. 1869. Hypnum strumosum (Hornsch.) C. Müll., Syn. 2: 238. 1851. Hookeria strumosa Hornsch., Fl. Bras. 1(2): 69. 1840. Type. Brazil: Serra dos Orgaô, prope Tijucam, Olfers s.n.
Leucomium aneurodictyon (C. Müll.) Jaeg., Ber. Thätigk. St. Gallischen Naturwiss. Ges. 1877–78: 275. 1880. Hypnum aneurodictyon C. Müll., Syn. Musc. Frond. 2: 681. 1851.
Plants slender, soft, whitish to yellowish green, in loose mats. Stems creeping, irregularly or sparsely branched. Leaves contorted when dry, more or less flattened when wet, leaf shape extremely variable, but usually 1.5–2.0 mm long, slightly asymmetric, becoming narrow at base, oblong-ovate, gradually lanceolate above, apices acute to acuminate; leaf margins entire; costa none; laminal cells loose, thin-walled, smooth, elongate-hexagonal or lineariform, short at base; alar cells not differentiated. Autoicous or synoicous. Setae reddish brown, 8–18 mm long, incurved, somewhat papillose at top; capsules ca. 0.8 mm long, ovoid or oblong-ovoid, horizontal to pendulous; stomata superficial; opercula long-rostrate, the same length as hypophysis; exostome teeth narrowly lanceolate, thin, hyaline, longitudinal furrows in the center, with dense ridges and stripes outside, densely striate; endostome segments densely papillose, folded; basal membrane high; cilia absent or reduced. Calyptrae long-cucullate, smooth, sparely pilose. Spores 8–10 µm in diameter.