1. Grimmia anodon Bruch & Schimp. in B.S.G. 无齿紫萼藓 wu-chi zi-e xian
Bryol. Eur. 3: 110. tab. 236 (fasc. 25–28). 1845. Anodon ventricosus Rabenh., Deutschl. Krypt.-Fl. 2(3): 154. 1848. Schistidium anodon (Bruch & Schimp.) Loeske, Laubm. Eur. Part I: 49. 1913. Gasterogrimmia anodon (Bruch & Schimp.) Buyss., Feuille Jeunes Naturalistes 13: 63. 1883. Type. Germany: “In muris et ad rupes calcareas; prope Heidelberg ad arcem (A. Braun) (lectotype BM, designated by T. Cao & Vitt 1986); in monte pinifero prope Gefrees (Funk) (syntype BM).
Schistidium tibetanum J.-X. Luo & P.-C. Wu, Acta Phytotax. Sin. 18(l): 121. 1980. Type. China: Xizang (Tibet): Ban-ge Co., B.-S. Li 7601 (holotype PE).
Plants rather small, up to 1.5 cm high, dark green to brownish above, brown to dark brown below, in dense cushions. Stems branched from innovations, with well developed central strand in cross section. Leaves erect, imbricate when dry, erect-spreading when moist, fragile, 1.2–1.9 mm long, the upper leaves enlarged, broadly oblong-lanceolate, slightly concave, acute, ending in a long, denticulate hyaline hair-point; the lower leaves oblong-lanceolate to lanceolate, blunt, muticous or short-awned; margins plane, entire; costa prominent, ending near the apex, with small median cells in cross section; upper cells unistratose or in places bistratose near or at the margins, 7–10 µm wide, rounded-quadrate, with thick, more or less nodulose walls; basal cells elongate-rectangular, pale and hyaline, with straight, thin walls. Autoicous. Perichaetial leaves similar to the upper stem leaves. Setae shorter than capsules, slender, curved; capsules immersed, small, 0.6–0.8 mm long, subglobose, ventricose, wide-mouthed after dehiscence; exothecial cells elongate with thin walls; annuli wanting; opercula plano-convex, bluntly mucronate; peristome none. Calyptrae mitrate, deeply lobed, smooth. Spores 8–11 µm in diameter, yellowish brown, granulose in regular rows.