2. Plagiothecium curvifolium Schlieph. ex Limpr. 弯叶棉藓 wan ye mian xian
Laubm. Deutschl. 3: 269. 1897. Plagiothecium denticulatum var. curvifolium (Limpr.) Meyl., Bull. Soc. Vaud. Sci. Nat., ser. 5, 41: 151. 1905. Type: Europe.
Plants small to medium-sized, green or yellowish green, glossy, often in dense mats. Stems prostrate, irregularly branched; leafy branches complanate, 5–15 mm × 1.3–3.0 mm; central strand not clearly differentiated. All leaves complanate or nearly so, not concave, ovate-lanceolate, 1.0–1.5 mm × ca. 0.5 mm, distinctly asymmetric, gradually acuminate or shortly acuminate; margins plane or narrowly reflexed on one side, entire or minutely serrulate near the apex; costae forked, slender; median leaf cells linear-rhomboidal, 80–160 µm × 6–8 µm; apical cells shorter; basal cells broader, shorter, often porose; alar regions decurrent, consisting of 2–4 rows of hyaline, often rectangular cells. Autoicous. Perichaetial leaves ovate, shortly acuminate; costae not distinct. Setae 8–15 mm long, reddish or reddish brown; capsules usually horizontal, cylindrical, curved, 1.5–2.0 mm long; opercula conic-rostrate, with a short beak; annuli developed, consisting of 2 rows of cells; cilia 2–3, nodulose. Spores 9–13 µm in diameter, papillose.