29. Dicranum viride (Sull. & Lesq.) Lindb., Hedwigia. 2: 70. 1863; Campylopus viridis Sull. & Lesq., Musci Hep. U.S. (repr.) 103. 1856.
Dicranum fulvum ssp. viride (Sull. & Lesq.) Lindb. in Hartm., Handb. Skand. Fl. (ed. 9) 2: 68. 1864. Dicranum fulvum var. viride (Sull. & Lesq.) Grout, Moss Fl. N. Amer. 1: 80. 1937.
Plants small, up to 2 cm high, dull, dark green or brownish green, in compact tufts. Stems erect or ascending, simple or branched, densely tomentose below. Leaves rigid and fragile, tips often deciduous, flexuose or slightly falcate-secund, not crispate when dry, erect-spreading when moist, narrowly lanceolate, up to 6 mm × 0.5 mm, gradually narrowed to a linear, channeled, filiform acumen, coarsely papillose at the tips; margins plane, serrulate only at the apex because of papillose cells; costa stout, rather broad, occupying ca. 1/3 the leaf base width, excurrent, ending in a long, serrulate hairpoint, smooth at back above; upper cells subquadrate to short-rectangular, thick-walled, slightly porose, obscurely bistratose; basal cells elongate, rectangular, thick-walled, not clearly porose; alar cells quadrate, inflated, unistratose, thick-walled, brownish at the margins, becoming hyaline close to the costa. Dioicous. Male plants normal. Perichaetial leaves convolute-sheathing at base, gradually narrowed to a long, setaceous subula. Setae single, straight, slender, up to 10 mm long, pale yellowish; capsules cylindric, erect, symmetric, 3–4 mm × 0.5 mm, yellowish brown, slightly furrowed when dry; opercula erect, conic-rostrate; annuli none; peristome teeth lanceolate, inserted below the mouth, ca. 0.2 mm long, divided to the middle, or lower, papillose above, coarsely and vertically striolate below. Spores 20–25 µm in diameter, minutely papillose.
Chinese specimens examined: GUIZHOU: Sui-yang Co., C. Gao et al. 33340 (IFSBH), 33301 (MO). SICHUAN: Tian-quan Co., C. Gao et al. 17887 (IFSBH). YUNNAN: Da-guan Co., X.-J. Li 4189 (IFSBH, KUN).
Habitat: on bases of trees, rarely on rocks; Distribution: China, Korea, Japan, and North America.
Illustrations: C. Gao (ed.) 1994 (Pl. 113, figs. 1–10).