16. Plagiothecium succulentum (Wilson) Lindb. 长喙棉藓 chang hui mian xian
Bot. Not. 1865: 43. 1865. Hypnum succulentum Wilson, Bryol. Brit. 407. 1855, nom. inval. in synon. Hypnum denticulatum var. succulentum Wilson, Bryol. Brit. 407. 1855. Type: Europe.
Plants rather robust, dark green or yellowish green, strongly glossy, in dense mats. Stems prostrate, irregularly branched, sometimes with ascending branches; central strand differentiated. All leaves usually more or less symmetric, broadly ovate-lanceolate to oblong-lanceolate, 2–3 mm × 1.0–1.3 mm, concave, sometimes plicate or reflexed at apex; margins plane or slightly recurved, mostly entire or rarely minutely serrulate near leaf apex; costae short, double, forked; median leaf cells linear-rhomboidal, 120–200 µm × 12–18 µm, thin-walled; apical cells not differentiated; basal cells shorter, broader; alar regions narrowly decurrent, consisting of elongate-rectangular to linear cells. Brood bodies often present in leaf axils. Autoicous. Setae 15–25 mm long; capsules nearly erect or slightly arcuate, cylindrical, ca. 2.0–2.2 mm long, with a distinct neck; opercula long conic-rostrate; peristome typical for the genus; cilia 2–3. Spores 12–14 µm in diameter, nearly smooth or minutely papillose.