16. Grimmia obtusifolia C. Gao & T. Cao in C. Gao, G.-C. Zhang & T. Cao 钝叶紫萼藓 dun-ye zi-e xian
Acta Bot. Yunnan. 3(4): 394. 1981. Type. China: Xizang, Shuang-hu Co., alt. 4850 m, K.-Y. Lang 1347 (holotype IFSBH; isotypes ALTA, PE); Ban-ge Co., alt. 4800 m, K.-Y. Lang 1232 (paratypes IFSBH, MO, PE).
Plants small, slender, up to 1.0(–1.5)cm high, dark green to blackish brown above, brownish to pale brown below, in dense tufts. Stems erect, much branched from innovations beneath the apex, with well developed central strand in cross section. Leaves erect, imbricate, closely appressed when dry, erect-spreading when moist, concave, somewhat cucullate, not keeled, 0.7–1.4 mm long, oblong-ovate, rounded-obtuse, muticous, the lower leaves smaller and wider at base; margins plane, entire; costa prominent, ending just below the apex, with small median cells in several irregular rows in cross section; upper and median cells bistratose throughout, obscure, 5–7 µm wide, rounded-quadrate, with thick, more or less sinuose walls; basal marginal cells subquadrate to quadrate, 12–14 µm wide, with straight, somewhat thick walls; basal juxtacostal cells elongate to rectangular, 15–21 µm × 7–9 µm, with thick, straight to sinuose walls; alar cells differentiated, large, ca. 21 µm × 14–16 µm. Sporophytes unknown.