2. Ditrichum brevidens Nog. 短齿牛毛藓 duan-chi niu-mao xian
J. Jap. Bot. 20(5): 255. 1944. Type. China: Taiwan, Tai-nan Co., Noguchi 6352 (holotype NICH).
Plants minute to medium-sized, 0.3–3.0 cm high, yellowish green, in dense tufts. Stems erect, simple, or sparsely branched. Leaves erect-appressed when dry, erect-spreading when moist, the upper leaves larger, 2.0–2.1 mm long, the lower ones 1.0–1.4 mm long, gradually to rather abruptly narrowed from an ovate base to a setaceous to subulate acumen; margins plane, entire; costa stout, percurrent to shortly excurrent; upper cells (shoulder cells) short-rectangular, 13–26 µm × 5–7 µm, thin-walled; basal cells elongate, rectangular, 20–40 µm × 8–12 µm, thin-walled, pellucid. Dioicous. Setae straight, ca. 1 cm long, yellowish; capsules erect to suberect, oblong-cylindric, ca. 2.4 mm × 0.5–0.6 mm, yellowish brown, contracted at the mouth; opercula short, conic-rostrate; annuli in 2 rows of large, thick-walled cells, deciduous; peristome teeth short, linear, 80–100 µm long, undivided, reddish brown, densely papillose. Spores 10–13 µm in diameter, nearly smooth.