2. Trachycystis microphylla (Dozy & Molk.) Lindb. 疣灯藓 you deng xian
Not. Sällsk. Fauna Fl. Fenn. Förh. 9: 80. 1868. Rhizogonium microphyllum (Dozy & Molk.) A. Jaeger, Ber. Thätigk. St. Gallischen Naturwiss. Ges. 74: 224. 1873. Mnium microphyllum Dozy & Molk., Musci Frond. Ined. Archip. Ind. 2: 26. 1846. Type: Japan.
Mnium crispatum Schimp. ex Besch., Ann. Sci. Nat., Bot., ser. 7, 17: 347. 1893, nom. illeg.
Mnium microphyllum var. tenellum Sakurai, Bot. Mag. (Tokyo) 50: 373. 1936.
Rhizogonium radiatum (Wilson) A. Jaeger, Ber. Thätigk. St. Gallischen Naturwiss. Ges. 74: 224. 1875. Mnium radiatum Wilson, London J. Bot. 7: 274. 1848.
Plants small to medium-sized, slender, in loose tufts. Stems erect, ca. 1.0–1.5(–3.0) cm high, simple or multi-branched at apex, branches often secund when dry. Leaves oblong- to ovate-lanceolate, 1.0–2.0 mm × 0.6 mm, broader at base, gradually acute at apex; margins not clearly bordered, unistratose, single-toothed at the upper margins; costae percurrent, dentate at back; leaf cells small, rounded-hexagonal, ca. 8–13 µm wide, thin-walled, papillose or mammillose on both sides; marginal cells rounded-hexagonal to shortly rectangular, smooth, hyaline, forming an indistinct border; lower stem leaves smaller, sparse, dimorphic, triangular-ovate, entire at margins. Dioicous. Sporophytic features the same as those of the genus.