4. Plagiomnium cuspidatum (Hedw.) T. Kop. 匐灯藓 fu deng xian
Ann. Bot. Fenn. 5: 146. 1968. Mnium cuspidatum Hedw., Sp. Musc. Frond. 192. pl. 45. 1801. Type: Europe.
Mnium silvaticum Lindb., Not. Sällsk. Fauna Fl. Fenn. Förh. 9: 59. 1868.
Plants dark green or yellowish green, not glossy, in loose tufts. Stems and infertile branches prostrate or curved, sparsely foliate, with brownish rhizoids; fertile branches erect, 2–3 cm high. Leaves crowded at upper part of branches, broadly rounded-ovate or nearly elliptical to oblong-lanceolate, ca. 5.0 mm × 3.0 mm, narrowed and decurrent at base, abruptly acute and apiculate at apex; margins distinctly bordered, serrate with a single tooth above mid-leaf; young branch leaves entire; costae percurrent or shortly excurrent, smooth at back; leaf cells hexagonal or irregularly rounded, thin-walled, sometimes slightly thickened at corners. Synoicous. Setae solitary, ca. 2.0–3.0 cm long, yellowish red; capsules elongate-ovoid, pendulous.