Dicranum longifolium

Comprehensive Description

provided by North American Flora
Dicranum longifolium Hedw. Descr. 3: 24. 1791
Dicranodontium nitidum T. P. James, Bull. Torrey Club 6: 34. 1875. Dicranum serratum Kindb. Eur. & N. Am. Bryin. 190. 1897. Campylopus canadensis Kindb. Rev. Bryol. 32: 35. 1905.
Dioicous : male plants more slender than the fertile and mingled with them : fertile plants in dense, often extensive tufts, light to dark, glossy-green, with paler leaf-bases giving a characteristic appearance to the rather slender stems 3-4 cm., rarely 8 cm., high: stem-leaves up to 8 mm. long, mostly falcate-secund, long-lanceolate, subtubulose and rough above; costa broad, filling all of the upper part of the leaf, ribbed on the back, the ribs and margins rather uniformly and finely serrulate more than one half down, about 200 n wide at the base, often more than one half the width of the leaf, gradually becoming slightly wider upward, then tapering gradually to the apex, in cross-section showing a thickness of 3 or 4 rows of cells of nearly uniform size, the middle and lower rows interruptedly chlorophyllose, with cellwalls somewhat unequally thickened; alar cells brownish to hyaline, extending to the costa, more or less auriculate; cells of the narrow blade elongate, 8-10 y. wide and 30-60 ft long toward the costa, with more or less thickened, pitted walls; inner perichaetial leaves rather narrowly costate, convolute, abruptly narrowed to a slender, rough point about as long as the broader part: seta straw-colored, sometimes reddish, solitary, 1-2 cm. long: capsule erect, cylindric, nearly straight, 2-2.5 mm. long, somewhat furrowed when dry, with a slender-beaked lid scarcely as long; annulus wanting; peristome-teeth reddish, more or less obliquely striate on the outer face, mostly unequally divided two thirds down or more into two forks, 60 y. wide at the base, with the inner articulations about 12 p apart: spores slightly roughened, up to 28 n in diameter.
Type locality Europe.
Distribution: Newfoundland to St. Paul's Island, Behring Sea, and southward to North Carolina and Colorado; also in Europe and Asia.
bibliographic citation
Robert Statham Williams. 1913. (BRYALES); DICRANACEAE, LEUCOBRYACEAE. North American flora. vol 15(2). New York Botanical Garden, New York, NY
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