25. Orthotrichum rupestre Schleich. ex Schwägr.   石生木灵藓  shi sheng mu ling xian

Sp. Musc. Frond., Suppl. 1, 2: 27. pl. 53. 1816. Dorcadion rupestre (Schleich. ex Schwägr.) Lindb., Musci Scand. 29. 1879. Type: Austria.

 

Plants medium-sized, deep green above, dark brown to black below, in loose tufts. Stems 2.2–2.5 cm long, dichotomously branched, sometimes naked below, with rhizoids only at the base. Leaves erect, appressed when dry, ovate-lanceolate, 3.5–4.7 mm × 0.8–1.2 mm, narrowly acute to long acuminate, sometimes keeled in the middle, partially or completely bistratose; margins entire, revolute almost throughout; costae subpercurrent; upper leaf cells rounded-quadrate to shortly rhomboidal, 9–15 µm × 6–12 µm, thick-walled, with 1–2 very low, rarely branched papillae per cell; lower cells elongate-rectangular to linear, 35–85 µm × 5–8 µm, thick-walled, porose, smooth, cells gradually becoming shorter toward margin; alar cells reddish brown, sometimes in a small auricle. Gemmae not seen. Goniautoicous. Perichaetial leaves not differentiated. Setae very short; capsules immersed or emergent, ovoid to oblong-ovoid, furrowed in the upper part when dry, not constricted at mouth; exothecial cells slightly differentiated in longitudinal bands; stomata superficial; peristome single or double; sometimes prostome present; exostome teeth in 8 pairs, reddish brown, erect or spreading when dry, splitting into 16; endostome segments 8, shortly lanceolate, hyaline, smooth. Calyptrae oblong-conic, hairy. Spores spherical, 18–25 µm in diameter, papillose.