4. Polytrichastrum longisetum (Sw. ex Brid.) G. L. Smith 细叶拟金发藓 xi ye ni jin fa xian
Mem. New York Bot. Gard. 21(3): 35. 1971. Polytrichum longisetum Sw. ex. Brid., J. Bot. (Schrader) 1800(1): 286. 1801. Type: Europe.
Polytrichum gracile Dicks. in Menz., Bot. Zeitung (Regensburg) 1: 74. 1802.
Plants rather small. Stems erect, 2–3 cm high, usually simple. Leaves 5–8 mm long, slightly crisped or erect when dry, erect-spreading when moist, with an indistinct sheathing base; ventral lamellae in 30–45 rows, mostly 4–7 cells high, oblate, thin-walled; apical cells of lamellae arching, as wide as the lower cells; leaf margins dentate; costae rather narrow, often dentate at piliform apex; median cells mostly hexagonal, thin-walled. Autoicous or dioicous. Setae 1–2 cm long; capsules 4–5 obtusely keeled, with short apophyses, usually exserted, epiphragm present; peristome teeth 64, fleshy. Spores spherical, 18–20 µm in diameter, verrucose.