15. Grimmia montana Bruch & Schimp. in B.S.G. 高山紫萼藓 gao-shan zi-e xian
Bryol. Eur. 3: 128. tab. 250 (fasc. 25–28. Monogr. 2). 1845. Guembelia montana (Bruch & Schimp.) Hampe, Bot. Zeitung (Berlin) 4(8): 125. 1846. Type. Norway: Felsen auf dem Donnersberg, Gümbel. April 1843 (lectotype BM, designated by T. Cao & Vitt 1986).
Plants small, up to 1.5 cm high, green to dark green above, dark brown to blackish below, in dense tufts or cushions. Stems sparsely branched, with poorly developed central strand in cross section. Leaves erect, imbricate when dry, spreading when moist, 1.7–2.4 mm long, narrowly lanceolate from an ovate base, keeled above, ending in a more or less long, spinulose, hyaline hair-point; margins plane on both sides, bistratose above; costa percurrent, consisting of nearly uniform cells or with small abaxial cells in basal part of leaf in cross section; upper cells bistratose in places, obscure, irregularly rounded-quadrate, thick-walled, 5–7 µm wide; basal marginal cells quadrate to short-rectangular, 9–23 µm × 9–11 µm, somewhat hyaline, with transverse walls thicker than longitudinal ones; basal juxtacostal cells rectangular, 23–40 µm × 5–7 µm, with thick, straight or slightly sinuose walls. Dioicous. Perichaetial leaves larger than upper stem leaves, with elongate hyaline hair-points. Setae erect, straight, yellowish, 2.0–2.4 mm long; capsules exserted, erect, ovoid-elliptic, smooth when moist, smooth or slightly wrinkled when dry, reddish brown, ca. 1.4 mm long; exothecial cells elongate-hexagonal, thin-walled; stomata none; annuli wanting or poorly developed; opercula with oblique beaks; peristome teeth single, erect, sometimes reflexed when dry, lanceolate, reddish brown, irregularly cleft and perforate above, both outer and inner surface coarsely papillose throughout. Calyptrae cucullate. Spores yellowish, smooth.