10. Dicranum groenlandicum Brid. 格陵兰曲尾藓 ge-ling-lan qu-wei xian
Muscol. Recent. Suppl. 4: 68. 1819. Dicranum elongatum Schleich. ex Schwaegr. ssp. groenlandicum (Brid.) Moenk., Laubm. Eur. 210. 1927. Type. Greenland.
Dicranum elongatum var. sphagni T. Jens., Vidensk. Meddel. Dansk Naturhist. Foren. Kjobenhavn 1858(1–4): 58. 1858.
Plants medium- to large-sized, 3–12 (–15) cm high, yellowish green or brownish green, shiny, in dense tufts. Stems erect, simple or branched, densely tomentose below the middle. Leaves erect, stiff, appressed when dry, erect-spreading when moist, narrowly to ovate-lanceolate, ca. 3.0 mm × 0.6–0.8 mm, gradually to rather quickly narrowed to a subtubulose acumen; margins plane below, slightly involute above, unistratose, nearly entire throughout; costa slender, occupying ca. 1/10–1/8 the leaf base width, smooth at back above, percurrent; upper cells rounded rhomboidal, thick-walled, somewhat porose; basal cells elongate, thick-walled, strongly porose; alar cells rounded quadrate, inflated, unistratose, golden brown. Dioicous. Setae slender, ca. 1.5 cm long, yellowish when young, brownish when old; capsules erect or slightly curved when dry, short-cylindric; opercula long-rostrate; annuli in 1–2 rows of large cells; peristome teeth divided to the middle, pale and smooth at tips, vertically striolate below, orange brown. Spores 20–24 µm in diameter, faintly papillose.