27. Brachythecium plumosum(Hedw.) Schimp. in B.S.G.   羽枝青藓   yu zhi qing xian Bryol. Eur. 6: 8. pl. 537. 1853. Cirriphyllum plumosum (Hedw.) Loeske & M. Fleisch., Allg. Bot. Z. Syst. 13: 22. 1907. Hypnum plumosum Hedw., Sp. Musc. Frond. 257. 1801. Type: Europe. Brachythecium oedistegum (Müll. Hal.) A. Jaeger, Ber. Thätigk. St. Gallischen Naturwiss. Ges. 1876–77: 342. 1878. Hypnum oedistegum Müll. Hal., Syn. Musc. Frond. 2: 350. 1851. Brachythecium pygmaeum Takaki, J. Hattori Bot. Lab. 15: 62. 1955. Brachythecium suzukii Broth. in Dixon, Rev. Bryol., n.s., 4: 160. 1931[1932], nom. nud. Brachythecium truncatum Besch., Ann. Sci. Nat., Bot., ser. 7, 17: 374. 1893. Brachythecium uematsui Broth. in Cardot, Bull. Soc. Bot. Genève, ser. 2, 3: 292. 1911.   Plants medium-sized, pale green, somewhat glossy, in dense mats. Stems prostrate, to 4 cm long, pinnately or irregularly pinnately branched, densely foliate. Stem leaves erect-spreading when dry and moist, ovate-lanceolate, 1.80–1.85 mm × 0.72–0.81 mm, concave, bi-plicate, gradually acuminate at apex; margins plane, entire below, serrulate above; costae ending beyond mid-leaf; median leaf cells linear, 80–90 µm × 7–8 µm, thin-walled; basal cells shorter, broader; alar cells clearly differentiated, quadrate or shortly rectangular; branch leaves narrowly ovate-lanceolate, 1.65–1.81 mm × 0.47–0.59 mm, concave, slenderly acuminate at apex, often constricted at base. Dioicous. Perichaetial leaves lanceolate. Setae to 20 mm long, papillose in the upper part; capsules elongate-ellipsoidal, inclined; opercula conic; peristome double; exostome teeth ca. 0.5 mm long; endostome segments as long as exostome teeth, perforate; cilia long, nodulose. Spores not seen.  

Provided by: [B].Moss Flora of China

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