1. Racomitrium aciculare (Hedw.) Brid. 钝叶砂藓 dun-ye sha xian
Muscol. Recent. Suppl. 4: 80. 1819. Bryum aciculare (Hedw.) Jolycl., Syst. Sex. Vég. 750. 1803. Dicranum aciculare Hedw., Sp. Musc. Frond. 135. 1801. Type. Europe: Helvetia.
Racomitrium molle Card., Bull. Herb. Boissier, ser. 2, 8: 333. 1908.
Plants stiff, small, up to 2.0(–3.0) cm long, dark green or yellowish green above, brownish below, in loose tufts. Stems erect or ascending, simple or sparsely branched; central strand absent. Leaves appressed and imbricate when dry, erect-spreading when moist, oblong-ligulate, 1.7–1.9 mm × 0.85–1.00 mm, slightly concave above, rounded-obtuse and without hyaline hair-points at the apex; margins mostly plane, slightly recurved near base, entire or somewhat denticulate; costa disappearing below the leaf apex; upper leaf cells quadrate to subquadrate, ca. 9–10 µm wide, minutely papillose, with slightly sinuose walls, unistratose at margins; median cells short-rectangular, 11–18 µm × 7–8 µm, sinuosely thick-walled, papillose, unistratose at margins; basal cells rectangular to elongate-rectangular, 20–46 µm × 6–8 µm, walls sinuosely thickened, often papillose; alar cells differentiated into a group of inflated, thin-walled, yellowish cells, ca. 20–30 µm × 12–16 µm. Sporophytes not seen in Chinese material.