16. Plagiomnium venustum (Mitt.) T. Kop. 瘤柄匐灯藓 liu bing fu deng xian
Ann. Bot. Fenn. 5: 146. 1968. Mnium venustum Mitt., Hooker's J. Bot. Kew Gard. Misc. 8: 231. pl. 12. 1856. Type: North America. West Coast.
Plants medium-sized, in loose tufts. Primary stems prostrate, sparsely foliate, with dense rhizoids; fertile branches erect, ca. 2.0–2.5 cm high, radiculose below, densely foliate above. Leaves crisped when dry, spreading when moist, narrowly oblong-obovate or narrowly elliptical, 4–7 mm × 2.8–3.5 mm, narrowed and decurrent at base, abruptly acute, apiculate at apex; margins distinctly bordered, serrate with 1–2-celled teeth near apex; costae percurrent; leaf cells obliquely rectangular to oblate. Synoicous. Setae clustered, 3–4 cm long, yellowish brown, densely papillose; capsules elongate-ovoid, horizontal to pendulous, papillose at neck area, stomata present; opercula conic, rostrate; peristome double; basal membrane ca. 1/2 the height of the teeth; cilia 2–3.