8. Racomitrium crispulum (Hook. f. & Wils.) Hook. f. & Wils. 爪哇砂藓 zhao-wa sha xian
Dryptodon crispulus Hook. f. & Wils., Fl. Antarct. 1: 124. pl. 57 f. 9. 1844. Type. New Zealand: Campbell Island, on alpine rocks, J. D. Hooker s.n.
Racomitrium angustifolium Broth., Symb. Sin. 4: 46. 1929. Type. China: Yunnan, Wei-xi Co., Handel-Mazzetti 9489 (holotype H). Synonymized by Gangulee 1972.
Plants medium-sized to rather large, up to 4 cm long, brownish green, in dense tufts. Stems repeatedly bifurcately branched; central strand absent. Leaves imbricately appressed when dry, erect-spreading when moist, linear-lanceolate, 2.2–2.7 mm long, not clearly keeled above, with short, smooth, not dentate hyaline hair-points, sometimes hair-points absent; margins recurved on one side; costa slender, percurrent; upper leaf cells shortly rectangular, smooth, sinuosely thick-walled, bistratose (rarely tristratose) at margins; median cells rectangular to elongate-rectangular, 12–30 µm × ca. 6 µm; basal cells elongate-rectangular, 30–50 µm × 6–7 µm, strongly sinuosely thick-walled; alar cells not differentiated, with only a row of 12–20 differentiated cells on the basal margins, hyaline, with straight walls. Perichaetial leaves broader at base, without hair-points. Setae erect, ca. 5.5 mm long; capsules oblong-ovoid, ca. 1.3 mm long; peristome teeth linear-lanceolate, divided to the low part; basal membrane present. Spores spherical, 9–13 µm in diameter, finely papillose.