1. Microdus brasiliensis (Duby) Thér., Bull. Herb. Boissier, sér. 2. 7: 278. 1907; Weissia brasiliensis Duby, Mém. Soc. Phys. Geneve 7: 412. pl. 4. 1836.
Dicranella brasiliensis (Duby) Bartr., Philippine J. Sci. 68: 34. 1939.
Microdus pomiformis (Griff.) Besch. in Pairs, Index Bryol. 805. 1897. Didymodon pomiformis Griff., Calcutta J. Nat. Hist. 2: 508. 1842.
Plants very small, up to 5(–7) mm high, yellowish green or yellowish, in loose tufts. Stems erect, simple or sparsely branched. Leaves up to 2 mm long, erect or falcate, flexuose or slightly crispate when dry, lower leaves smaller, upper ones larger, lanceolate from a narrowly ovate base, gradually narrowed to a subulate apex; margins plane or slightly incurved; costa thick, occupying ¼ – 1/3 the leaf base width, brownish, excurrent; cells elongate-rectangular to narrowly rhomboidal, 4–5:1 near the base, shorter toward the apex; alar cells not differentiated. Perichaetial leaves much longer than stem leaves. Setae 5–7 mm long, straight, flexuose when dry, yellowish; capsules small, ovoid to subglobose, 0.6–0.7 mm × 0.4–0.5 mm, smooth; opercula long-rostrate, longer or as long as the urns; peristome teeth short, very irregularly cleft, perforate, finely papillose. Spores 14–18 µm in diameter, brownish, finely papillose.
Chinese specimens examined: HAINAN: Tong-shi Co., P.-J. Lin 2008 (IBSC, IFSBH). SICHUAN: Mu-li Co., C. Gao et al. 26420 (IFSBH). XIZANG: Lang-xian Co., M. Zang 1854 (IFSBH, KUN). YUNNAN: Li-jiang Co., Yunnan Univ. Biol. Dept. 1074 (IFSBH).
Habitat: on wet soil over rocks; Distribution: China, India, Sri Lanka, Myanmar, Indonesia, the Philippines, and South America.
Illustrations: Pl. 53, figs. 1–8.