9. Racomitrium cucullatulum Broth. 兜叶砂藓 dou-ye sha xian
Symb. Sin. 4: 47. 1929. Syntypes. China: Yunnan, between Landsang-djiang (Mekong) and Lu-djiang (Salwin), alt. 4200–4375 m, Handel-Mazzetti 9976 (syntype H); Sichuan, Hui-li Co., Handel-Mazzetti 951 (syntype H).
Plants medium-sized, 2–3 cm long, brownish, in dense tufts. Stems irregularly or subpinnately branched; central strand absent. Leaves imbricately appressed when dry, erect-spreading when moist, narrowly shortly ovate-lanceolate, 1.7–2.3 mm × 0.5–0.6 mm, cucullate and concave above, without or with very short, smooth hyaline hair-points; margins broadly recurved on one side to 3/4 the leaf length, plane or narrowly recurved on the other side to 1/2 the leaf length; costa percurrent, strongly convex on the dorsal side; upper and median leaf cells short-rectangular to rectangular, 7–25 µm × 6–8 µm, smooth, sinuosely thick-walled, bistratose at margins; basal cells elongate-rectangular, 25–40 µm × 7–8 µm, strongly sinuosely thick-walled; alar cells somewhat differentiated into a small group of yellowish, short-rectangular, straight and thin-walled cells. Perichaetial leaves broadly ovate- lanceolate, reflexed when moist, without hair-points. Setae erect, short, ca. 3.0–5.5 mm long; capsules cylindrical, ca. 1.6–1.8 mm long; opercula obliquely long-rostrate; peristome teeth linear-lanceolate, ca. 360 µm long, divided to the base, densely papillose. Spores spherical, ca. 12 µm in diameter.