2. Dicranum bonjeanii De Not. in Lisa 细肋曲尾藓 xi-le qu-wei xian
Elenc. Musch. Torino 29. 1837. Dicranum scoparium Hedw. ssp. bonjeanii (De Not.) Grout, Moss Fl. N. Amer. 1: 88. 1937. Type. Italy.
Plants medium-sized to large, up to 6 cm high, dull pale green or brownish green, shiny, in dense tufts. Stems erect, simple or branched, radiculose at base. Leaves in many rows, not homomallous, somewhat crispate when dry, erect-patent when moist, lance-lingulate, gradually narrowed down and slightly undulate from the upper third, obtuse at the apex; margins plane, entire below, irregularly serrate near the apex; costa thin, narrow, subpercurrent, serrate or roughened at back in the upper part; upper cells rounded short-rectangular to rhomboidal; basal cells rectangular, thick-walled, somewhat porose, forming several rows of narrower cells at the margins; alar cells quadrate to short-rectangular, thick-walled, somewhat inflated, not extending to the costa. Dioicous. Male plants dwarfed. Setae single or in cluster of 2, slender, up to 3.5 cm long, light brownish to reddish; capsules cylindric, inclined to horizontal, curved, sometimes strumose at base, plicate when dry; opercula long-rostrate, as long as the urns; annuli in 1–2 rows of large cells; peristome teeth dicranoid. Spores brownish, papillose.