7. Racomitrium carinatum Card. 短尖砂藓 duan-jian sha xian
Bull. Herb. Boissier, ser. 2, 8: 335. 1908. Type. Korea: Isl. Quelpaert, Faurie 643.
Plants medium-sized to rather large, up to 5 cm long, dark green, in loose tufts. Stems ascending, long and sparsely branched; central strand absent. Leaves lanceolate, carinately concave and keeled above, acuminate or bluntly acute at apex or apiculate with very short hyaline hair-points, consisting of a few smooth cells; margins somewhat recurved below on both sides, serrulate due to papillose cells; costa disappearing in the leaf apex; upper and median leaf cells quadrate to short-rectangular, ca. 4–8 µm wide, clearly with rounded papillae, unistratose at margins; basal cells rectangular to elongate-rectangular, strongly sinuosely thick-walled; alar cells not differentiated, with only a row of rectangular, slightly thick-walled, brownish cells. Perichaetial leaves oblong-ovate, rounded-obtuse at apex. Setae erect, ca. 3 mm long, smooth; capsules cylindrical, ca. 1.0–1.3 mm long; opercula long-rostrate; peristome teeth linear-lanceolate, divided to the base, ca. 0.3 mm long, densely papillose. Calyptrae campanulate, coarsely papillose on the upper half. Spores spherical, 12–14 µm in diameter.