22. Racomitrium verrucosum Frisvoll 粗疣砂藓 cu-you sha xian
Gunneria 59: 159. 1988. Type. Nepal: Between Thang La pass and Thudam, alt. 4550 m, Iwatsuki 1459.
small to medium-sized, up to 3–4 cm long, yellowish green above, brownish or blackish brown below, in dense cushions. Stems
irregularly branched; central strand absent. Leaves
imbricately appressed when dry, erect-spreading when moist, ovate-lanceolate, 1.3–1.8 mm × 0.35–0.50 mm, without or with short, smooth, not dentate hyaline hair-points; margins recurved nearly throughout on both sides, upper margins bistratose; costa thick, percurrent or shortly excurrent; upper leaf cells subquadrate to short-rectangular, 6–12 µm × 5–10 µm, mostly bistratose, densely papillose, obscure, somewhat sinuosely thick-walled; median cells short-rectangular, 7–15 µm × ca. 9 µm; basal cells narrowly rectangular, 25–50 µm × ca. 9 µm, strongly sinuosely thick-walled, porose; alar cells not differentiated, consisting of only a row of 16–25 hyaline, straight-walled cells. Perichaetial leaves
shortly ovate-lanceolate, obscure, acuminate, without hyaline hair-points. Setae
erect, ca. 4.5 mm long; capsules ovoid, erect, ca. 1.3 mm long; peristome teeth lanceolate, divided to the base. Spores
spherical, 12–16 µm in diameter.