13. Racomitrium himalayanum (Mitt.) Jaeg. 喜马拉雅砂藓 xi-ma la-ya sha xian
Ber. Thätigk. St. Gallischen Naturwiss. Ges. 1872–73: 97 (Gen. Sp. Musc. 1: 375). 1874. Grimmia himalayana Mitt., J. Proc. Linn. Soc., Bot., Suppl. 1: 45. 1859. Syntypes. Sikkim: J. D. Hooker 298, 301, 305, 321, 326. Nepal: Wallich s.n.
Racomitrium dicarpum Broth., Symb. Sin. 4: 47. 1929. Type. China: Yunnan, Doker-la between Mekong and Salwin, 28°15′N, alt. 4225 m, Handel-Mazzetti 8067 (holotype H).
Plants medium-sized, up to 2–4 cm long, yellowish green above, dark brownish below, in loose tufts. Stems ascending, irregularly branched; central strand absent. Leaves imbricately appressed when dry, erect-spreading when moist, narrowly ovate-lanceolate, 2.5–3.3 mm long, somewhat keeled above, with relatively short, not dentate, somewhat decurrent hyaline hair-points, sometimes hair-points reduced; margins distinctly recurved on both sides; costa stout, percurrent; upper and median leaf cells rectangular to elongate-rectangular, 12–36 µm × 5–7 µm, sinuosely thick-walled, smooth, unistratose at margins; basal cells elongate-rectangular, 24–48 µm × 5–7 µm, sinuosely thick-walled, smooth; alar cells scarcely differentiated, orange, with a marginal row of 3–5 larger, straight-walled cells. Perichaetial leaves smaller than stem leaves, ovate-lanceolate, without hyaline hair-points. Setae erect, yellowish brown, 10–15 mm long, twisted when dry; capsules oblong-ovoid to cylindrical, 1.0–1.5 mm long; opercula long-rostrate; annuli developed, with 2 rows of thick-walled cells; peristome teeth linear to linear-lanceolate, divided to the base, densely papillose. Spores small, 11–15 µm in diameter, yellowish green to yellowish brown, minutely papillose.