12. Plagiothecium piliferum (Sw.) Schimp. in B.S.G. 毛尖棉藓 mao jian mian xian
Bryol. Eur. 5: 186. 1852. Isopterygium piliferum (Sw.) Loeske, Stud. Morph. Syst. Laubm. 169. 1910. Plagiotheciella pilifera (Sw.) M. Fleisch. in Broth., Nat. Pflanzenfam. (ed. 2) 11: 466. 1925. Leskea pilifera Sw. in Hartm., Handb. Skand. Fl. 419. 1820. Type: Europe.
Plants small to medium-sized, slender, pale green or yellowish green, glossy, in dense mats. Stems prostrate, 1.0–5.0 cm long, irregularly branched; leafy branches somewhat julaceous. All leaves ovate, 0.8–1.5 mm × 0.4–0.8 mm, concave, abruptly contracted to a piliferous, often flexuose apex; margins entire, only serrulate at apex; costae double or forked, often unequal, with one branch distinctly longer than the other, reaching 1/4 the leaf length; median cells linear-rhomboidal, 66–110 µm × 5–6 µm, smooth; apical cells shorter; basal cells shortly rectangular; alar regions narrowly decurrent, consisting of 2–3 rows of rectangular cells, often ending with a single, elongate cell. Dioicous. Setae slender, 8–15 mm long; capsules erect or inclined, elongate-ovoid to cylindrical, 2.0–2.5 mm long; other features not seen.