石缝藓

Plants 1–2 cm high, often bluish green, shiny, gregarious or in loose tufts. Stems erect, often numerous branched, radiculose at base; central strand distinct. Leaves smaller and distant below, larger and crowded above, slightly contorted when dry, 1.2–2.0 mm long, ovate-lanceolate, gradually acuminate; margins plane, serrate near the apex; costa strong, percurrent or shortly excurrent; cells not much differentiated from the upper to the base, quadrate to short-rectangular, 10–16 µm × 10–13 µm, firm-walled, smooth, occasionally bistratose at the margins. Autoicous. Perichaetial leaves similar to the upper stem leaves. Setae slender, straight, 7–8 mm long, yellow; capsules erect, cylindric, slightly asymmetric, 1.5–2.0 mm long, somewhat furrowed or plicate when dry and empty; opercula slightly obliquely long-rostrate; annuli differentiated, in 2–3 rows of large, thick-walled cells; peristome teeth linear-lanceolate, divided nearly to the base, reddish brown and densely papillose above the middle, basal membrane low, yellow. Spores 13–16 µm in diameter, minutely papillose.

Type. Sweden: D. Swartz s.n.

Chinese specimens examined: HEILONGJIANG: Da Xing An Ling (Greater Khingan Mt.) C. Gao 12994 (IFSBH); Xiao Xing An Ling (Lesser Khingan Mt.), C. Gao 13322, 18301 (IFSBH); X.-L. Zhu 182 (MO). JILIN: Changbai Shan (Mt.), C. Gao 1080 (IFSBH). SHAANXI: Taibai Shan (Mt.), Z.-P. Wei 5481, 6706 (IFSBH, KUN).

Habitat: on soil and rocks; Distribution: China, Japan, Russian Far East, Europe, North America, South Africa, and New Zealand.

Illustrations: C. Gao 1994 (Pl. 37, figs. 1–10).