1. Plagiobryum demissum (Hook.) Lindb. 尖叶平蒴藓 jian ye ping shuo xian
Öfvers. Förh. Kongl. Svenska Vetensk.-Akad. 19: 606. 1863. Bryum demissum Hook., Musci Exot. 2: 16, f. 99. 1819. Type: Europe.
Plants small, ca. 5 mm high, green, in tufts. Stems simple or branched at base, with short branches. Leaves ovate-lanceolate or lanceolate, imbricate, keeled, apiculate; margins plane or slightly recurved, entire, not clearly bordered or bordered by 2–3 rows of narrower cells; costae long-excurrent; median leaf cells narrowly hexagonal or rectangular. Setae ca. 15 mm long, somewhat curved above; capsules pendulous, asymmetric, neck nearly as long as or longer than urn; mouth oblique; opercula conic; peristome double; endostome segments longer than teeth. Spores tetrad, spherical, ca. 36 µm in diameter, dark brown, coarsely papillose.