5a. Campylopus fragilis (Brid.) Bruch & Schimp. in B.S.G. ssp. fragilis 脆枝曲柄藓原亚种 cui-zhi qu-bing xian yuan ya-zhong
Bryol. Eur. 1: 164 (fasc. 41. Monogr. 4). 1847. Dicranum fragile Brid., J. Bot. (Schrader) 1800(2): 296. 1801. Type. Germany: Erlangen, Hoffmann. s.n.
Campylopus akagiensis Broth. & Yas., _fvers. Förh. Finska Vetensk.-Soc. 62A(9): 3. 1921.
Plants minute- to medium-sized, 5–30 mm high, comose foliate, green to yellowish green, in compact tufts. Stems erect, simple or branched, radiculose at base, often with numerous boomerang-shaped brood leaves in the axils of the upper leaves. Leaves appressed or slightly flexuose when dry, erect or erect-patent when moist, rather rigid at the tips, 3–6 mm long, lanceolate from a broad, ovate base, gradually narrowed to a finely subulate acumen; margins plane or slightly involute, entire or serrulate only at the apex; costa widest at about midleaf, gradually narrowed toward leaf base, occupying 1/3–2/3 the leaf base width, shortly excurrent in a non-hyaline tip, lightly ridged at back in the upper part, with only dorsal stereid band in transverse section; upper cells quadrate to short-rectangular; basal cells rectangular, rather thin-walled; alar cells not clearly differentiated, only somewhat inflated, hyaline. Dioicous. Setae straight, elongate, yellowish to yellowish brown; capsules erect or slightly curved; peristome teeth dicranoid; opercula shortly rostrate. Calyptrae fringed at base. Spores 9–20 µm in diameter.