1. Phascum cuspidatum Hedw. 球藓 qiu xian
Sp. Musc. Frond. 22. 1801. Type. Europe.
Plants minute, 1.3–2.0 mm high, light green or yellowish green, in loose or scattered tufts. Stems erect, usually simple; central strand absent. Leaves crowded, rosulate, appressed or slightly contorted when dry, erect-spreading when moist, ovate to obovate, 0.4–1.2 mm × 0.3–0.6 mm, acute to cuspidate at the apex; margins entire, plane or weakly revolute in the lower half; costa slender, long-excurrent, ending in a hyaline, piliferous awn, usually smooth or somewhat denticulate; upper leaf cells rounded quadrate to rhomboidal, 8–22 µm × 8–18 µm, thin-walled, usually with 1 to several C-shaped papillae, often with 2–3 rows of marginal cells smooth; basal cells enlarged, rectangular, 24–44 µm × 10–24 µm, smooth. Autoicous. Setae very short, 20–30 µm long, slightly curved; capsules immersed, globose, bluntly apiculate; opercula not developed; peristome none. Spores yellowish brown, 15–36 µm in diameter, densely papillose.