14. Grimmia mammosa C. Gao & T. Cao in C. Gao, G.-C. Zhang & T. Cao 粗瘤紫萼藓 cu-liu zi-e xian
Acta Bot. Yunnan. 3(4): 394. 1981. Type. China: Xizang (Tibet), Ya-dong Co., alt. 2900 m, M. Zang 71 (holotype IFSBH; isotypes ALTA, HKAS, NY).
Plants small, up to 1.5 cm high, dull, dark green to blackish green, in dense tufts. Stems sparsely forked, rigid, without distinct central strand in cross section. Leaves erect-appressed when dry, spreading when moist, 1.6–2.0 mm long, upper leaves larger than lower ones, broadly lanceolate to ovate-lanceolate, ending in a denticulate, hyaline hair-point (0.2–0.5 mm long), broadly concave, not keeled; the lower leaves blunt, muticous; margins plane, crenulate owing to bulging cells above middle part; costa broad, up to 1/3 the width of leaf base, becoming narrower toward apex, ending just below the awn, flattened, with a row of large adaxial cells and small abaxial stereid band in cross section; upper and median leaf cells bistratose, obscure, 5–7 µm wide, rounded-quadrate, distinctly bulging, each with a large tuberculum up to 4–5 µm in diameter; basal cells quadrate to subquadrate, 9–14 µm × 7–12 µm, yellowish, with thicker transverse walls. Dioicous. Perichaetial leaves similar to upper stem leaves, but with longer hair-points. Setae long, erect, up to 4 mm long; capsules exserted, erect, ovoid to cylindrical, narrowed at the mouth. Mature sporophytes not seen.