19. Racomitrium nitidulum Card. 阔叶砂藓 kuo-ye sha xian
Bull. Herb. Boissier, ser. 2, 8: 335. 1908. Racomitrium heterostichum var. nitidulum (Card.) Nog., Misc. Bryol. Lichenol. 1(15): 2. 1958. Type. Japan: Shizuoka Pref., Mt. Fujiyama, Faurie 338.
Racomitrium sudeticum var. robustum Broth. ex Ihs., Classif. Mosses Japan 93. 1932, hom. illeg.
Plants medium-sized to large, up to 6 cm long, yellowish green or brownish green above, brownish below, in dense cushions. Stems densely irregularly subpinnately branched; central strand absent. Leaves imbricately appressed when dry, erect-spreading when moist, narrowly ovate-lanceolate, shortly acuminate, 1.7–2.5 mm long, without or with very short, smooth, hyaline hair-points; margins recurved on one side to 1/2–3/4 the leaf length, plane or shortly recurved on the other side; costa strong, percurrent, convex on the dorsal side; leaf cells unistratose throughout, smooth, strongly sinuosely thick-walled; upper cells rounded-quadrate to shortly rectangular, 4–12 µm × 5–9 µm; median cells rectangular, 9–24 µm × 5–7 µm; basal cells elongate-rectangular to linear, 15–36 µm × 5–7 µm, porose; alar cells differentiated, yellowish or orange, somewhat auriculate, consisting of 3–5 rows of enlarged, quadrate or rectangular cells, with straight walls. Perichaetial leaves shortly ovate-lanceolate, without hyaline hair-points. Setae erect, 5–7 mm long; capsules cylindrical, 1.5–2.0 mm long; peristome teeth linear-lanceolate, divided to the base, densely papillose. Calyptrae not seen. Spores not seen.