2. Clastobryopsis planula (Mitt.) M. Fleisch. 拟疣胞藓 ni you bao xian
Musci Buitenzorg 4: 1180. 1923. Aptychella planula (Mitt.) M. Fleisch., Musci Buitenzorg 4: 1671. 1923. Clastobryum planulum (Mitt.) Broth., Nat. Pflanzenfam. I(3): 874. 1907. Symphyodon planulus (Mitt.) A. Jaeger, Ber. Thätigk. St. Gallischen Naturwiss. Ges. 1876–1877: 296. 1878. Stereodon planulus Mitt., J. Proc. Linn. Soc., Bot., Suppl. 1: 111. 1859. Type: India.
Aptychella borii Dixon, J. Bombay Nat. Hist. Soc. 39: 790. 1937.
Aptychella delicata (M. Fleisch.) M. Fleisch., Musci Buitenzorg 4: 1671. 1923. Clastobryopsis delicata M. Fleisch., Musci Buitenzorg 4: 1180. 1923.
Aptychella yunnanensis Broth., Symb. Sin. 4: 117. pl. 5, f. 1. 1929. Type: China. Yunnan, Handel-Mazzetti 8363.
Plants in mats, prostrate. Stems densely branched, erect, complanate. Stem and branch leaves broadly ovate or ovate-lanceolate, more than 2.0 mm long, decurrent, short acuminate at apex; costae double, short and faint, sometimes not evident; stem leaves reflexed at margins, 1.33–1.82 mm × 0.28–0.42 mm; branch leaves complanate, weakly toothed, 0.87–0.94 mm × 0.18–0.21 mm wide; leaf cells narrowly elongated or rhomboidal, 30–45 mm long; alar cells inflated, quadrate or rectangular, thin- or thick-walled, gradually becoming narrowly elongated upwards. Gemmae numerous, smooth, 0.36–0.56 mm long, composed of 8–12 cells in leaf axils at tips of branches. Inner perichaetial leaves narrowly lanceolate, acuminate. Sporophytes not common, usually on main stems. Setae 5–10(–15) mm long; capsules small, subglobular or ovoid, less than 1 mm long, inclined or horizontal; exothecial cells not or slightly collenchymatous; opercula conic, shortly rostrate; peristome double; exostome teeth lanceolate, densely papillose; endostome segments linear, papillose.