15. Brachythecium helminthocladum Broth. & Paris 粗枝青藓 cu zhi qing xian
Rev. Bryol. 31: 63. 1904. Brachythecium kuroishicum var. helminthocladum (Broth. & Paris) Cardot in Dixon, Rev. Bryol., n.s., 4: 158. 1931. Type: Japan. Honshu, Pref. Gumma, Tsunoda s.n.
Plants medium-sized, yellowish green. Stems prostrate, irregularly subpinnately branched, densely foliate, julaceous. Stem leaves appressed when dry, spreading when moist, broadly ovate to oblong-ovate, 1.85–2.66 mm × 0.9–1.17 mm, concave, somewhat plicate, abruptly acuminate at apex, slightly decurrent at base; margins plane, serrulate above, entire below; costae ending at mid-leaf; median leaf cells nearly linear, 53–75 µm × 7–8 µm, with rounded ends, thin-walled; alar cells clearly differentiated, inflated, hexagonal or shortly rectangular; branch leaves larger than stem leaves, leaf apices often curved. Autoicous? Perichaetial leaves reflexed. Setae ca. 15 mm long, smooth; capsules narrowly ovoid to shortly cylindrical; opercula conic; peristome double; endostome segments shorter than teeth; cilia usually 2. Spores not seen.