4. Weissia edentula Mitt. 缺齿小石藓 que-chi xiao shi xian
J. Proc. Linn. Soc., Bot., Suppl. 1: 27. 1859. Hymenostomum edentula (Mitt.) Besch., Bull. Soc. Bot. France 34: 95. 1887. Type. India: Madras, Wight s.n.
Hymenostomum leptotrichaceum (C. Müll.) Par., Index Bryol. Suppl. 189. 1990. Weissia leptotrichacea C. Müll., Nuovo Giorn. Bot. Ital., n. ser. 4: 259. 1897. Type. China: Shaanxi (Schen-si), Mt. La-y-san, Mar. 1896, J. Girald 1532.
Weissia platyphylloides Card., Beih. Bot. Centralbl. 19(2): 90. 2. 1905. Type. China: Taiwan (Formosa), Tamsui, Faurie 86 (isotype H).
Weissia semipallida C. Müll., Nuovo Giorn. Bot. Ital., n. ser. 5: 185. 1898. Type. China: Shaanxi (Schen-si), Sche-kin-tsuen, 3 IV 1897, P. J. Giraldi 2075 (isotype H).
Plants small, to 10 mm high, dark green, in dense tufts. Stems erect, usually irregularly branched. Leaves often crowded at stem tips, contorted-curved when dry, spreading when moist, narrowly lanceolate, ca. 3 mm long, sheathing at base, upper lamina often channeled, acuminate at apex; margins moderately incurved, entire or crenulate by projecting papillae; costa rather stout, shortly excurrent, ending in sharply mucronate tips; upper leaf cells subquadrate to rounded hexagonal, evenly thick-walled, densely pluripapillose; basal cells sharply differentiated, rectangular or oblong-elliptic, mostly thin-walled, smooth, hyaline. Autoicous. Setae straight, ca. 6 mm long; capsules erect, oblong-ovoid, ca. 1 mm long; annuli none; peristome none.