3. Trachycystis ussuriensis (Maack & Regel) T. Kop. 树形疣灯藓 shu xing you deng xian
Ann. Bot. Fenn. 14: 206. 1977. Mnium ussuriense Maack & Regel in Regel, Mém. Acad. Imp. Sci. Saint Petersbourg, ser. 7, 4(4): 182. 1861. Type: Russia. Ussuri, Maack s.n.
Herpetineuron serratinerve Sak., Bot. Mag. (Tokyo) 62: 107. pl. 10. 1949.
Mnium arcuatum Broth., Hedwigia 38: 221. 1899, hom. illeg.
Mnium curvulum C. Müll., Nuovo Giorn. Bot. Ital., n.s., 3: 91. 1896. Type: China. Shaanxi (Schen-si), Zulu, Aug. 1894, Giraldi s.n.
Mnium leucolepioides P.-C. Chen ex X.-J. Li & M. Zang, Acta Bot. Yunnan. 1: 52. 1979. China. Shaanxi, West Tai-bai-shan, Z.-P. Wei 6531 (holotype HKAS).
Trachycystis immarginata (Broth.) Laz., Bot. Žurn. (Kiev) 2(1): 63. 1941. Mnium immarginatum Broth., Acta Soc. Sci. Fenn. 19(12): 12. 1892.
Plants medium-sized to rather robust, dark green to yellowish green or reddish brown, usually in dense tufts. Stems often multi-branched; infertile branches usually arcuate when dry, ca. 3–4 cm long; fertile branches erect, 2–3 cm high, with many branchlets at apex. Leaves dense, crisped when dry, spreading when moist, oblong-ovate to broadly ovate, 2.5–3.5 mm × 1.0–1.3 mm, broader and slightly decurrent at base, gradually acute at apex; margins not clearly bordered, single-toothed above mid-leaf; costae percurrent, curved above, straight below, dentate at back; leaf cells small, rounded-hexagonal, ca. 12–15 µm wide, thick-walled, smooth. Dioicous. Setae solitary, 2.0–2.5 cm long, reddish brown; capsules oblong-cylindrical, 2.5–3.5 mm × 1.2–1.5 mm, horizontal or pendulous; other features the same as those of the genus.