2. Ceratodon stenocarpus Bruch & Schimp. in B.S.G. 疣蒴角齿藓 you-shuo jiao-chi xian
Bryol. Eur. 2: 146. 1846. Ceratodon purpureus ssp. stenocarpus (Bruch & Schimp.) Dix., New Zealand Inst. Bull. 3(2): 50. 1914. Ceratodon purpureus var. stenocarpus (Bruch & Schimp.) Dix., J. Bombay Nat. Hist. Soc. 39(4): 773. 1937. Type. Mexico: Chinanthe, F. M. Liebmann 84.
Ceratodon purpureus var. formosicus Card., Beih. Bot. Centralbl.19 (2): 100. 1905. Type. China: Taiwan, Tamsui (Tamshui), Faurie 85. Synonymized by Burley and Pritchard (1990).
Plants small, up to 1 cm high, yellowish green, in dense tufts. Stems erect, simple or rarely sparsely branched. Leaves crowded, strongly contorted when dry, erect-patent when moist, lanceolate or narrowly ovate-lanceolate, 1.0–1.9 mm long, gradually acuminate; margins strongly reflexed or revolute, irregularly serrate near the apex; costa stout, percurrent to shortly excurrent; upper and median cells quadrate, 8–10 µm wide, moderately thick-walled; basal cells rectangular, 13–20 µm × 13 µm, rather thin-walled. Dioicous. Perichaetial leaves larger than the upper stem leaves, highly sheathing at base. Setae straight, often yellow or sometimes reddish brown, ca. 1.5 cm long; capsules suberect, long-cylindric, 4–5 times as long as wide, 2.0–2.5 mm × 0.5 mm, deeply furrowed when dry, strumose at base; opercula shortly conic-rostrate; annuli differentiated, in 2–3 rows of thick-walled cells; peristome teeth linear-lanceolate, 0.3–0.4 mm long, divided nearly to the base, papillose, basal membrane low. Spores 8–11 µm in diameter, yellow, nearly smooth.