6. Weissia longifolia Mitt. 皱叶小石藓 zhou-ye xiao shi xian
Ann. Mag. Nat. Hist., ser. 2, 8: 317. 1851.
Weissia crispa (Hedw.) Mitt., Ann. Mag. Nat. Hist., ser. 2, 8: 316. 1851, hom. illeg. Astomum crispum (Hedw.) Hampe, Flora 20, 285. 1837. Phascum crispum Hedw., Sp. Musc. Frond. 21. 1801. Type. Britain: Mougeot & Nestler 703.
Astomum macrophyllum (Par. & Broth.) G. Roth, Aussereur. Laubm. 185. 1911. Systegium macrophyllum Par. & Broth., Rev. Bryol. 35: 125. 1908.
Astomum tonkinense (Par. & Broth.) Broth., Nat. Pflanzenfam. I(3): 1189. 1900. Systegium tonkinense Par. & Broth., Rev. Bryol. 33: 54. 1906.
Plants small, to 5 mm high, often dark green, in loose tufts. Stems erect, usually simple; central strand weakly developed. Leaves often crowded at stem tips, strongly crisped when dry, spreading when moist, narrowly lanceolate to oblong-lanceolate, sheathing at base, upper lamina often channeled, acuminate at apex; margins strongly incurved above the leaf base, entire or crenulate by projecting papillae; costa rather stout, shortly excurrent, ending in sharply mucronate tips; upper leaf cells rounded-hexagonal, evenly thick-walled, papillose, with bifid or C-shaped papillae; basal cells sharply differentiated, rectangular, forming a V-shaped leaf base, moderately thick-walled, smooth, hyaline. Autoicous. Setae very short, ca. 1 mm long; capsules erect, oblong-ovoid, immersed; annuli none; opercula not differentiated; peristome none.