BARNES NORTH AMERICAN MOSSES. 325 



differs from P. gracile also in capsule acute angulate, lid conic, rostrate, 

 leaves long sheathing. Mac. Cat. 154. In boggy ground; Selkirk Mts. 



369. Polytrichum sexangulare Fldrke. Stem 2-6 cm. long, generally 

 simple, erect, or decumbent, naked at base; tufts large, brownish green, 

 not tomentose: leaves rigid, erect incurved, sometimes incurved, large 

 oval and sheathing at base: then abruptly contracted into a lanceolate- 

 canaliculate point, sub-obtuse, very entire; lamellae about 30; perichaetial 

 leaves longer sheathing, mutinous: capsule erect or inclined, angular, six- 

 sided; lid long beaked; teeth unequal; calyptra not reaching base of cap- 

 sule. Husnot, Muse. Gall. 279. Mt. Hood, Oregon. 



370. Polytrichum Ohioense Ren. & Card. Stem erect, simple or bi- 

 partite, a little tomentose below: leaves spreading when moist, erect flexu- 

 ous when dry, from a sheathing base linear-acuminate, cuspidate, serrate; 

 lamellae about 50; perichaetial leaves longer with a hyaline base; pedicel 4-8 

 cm. long, reddish below, pale above; capsule erect, finally horizontal, 

 tetragonal or pentagonal, rarely hexagonal, acute angled, rather narrowed 

 towards the base, with a very small or indistinct hypophysis. Bot. Gaz . 

 13:199. 1888. Northern, eastern and southern United States; British 

 Columbia; Canada. 



371. Polytrichum Canadense Kindb. Stem low, about 6-8 cm. high: 

 pedicel not much longer; capsule blackish, much shorter than in the 

 type. Prince Edward Island; Quebec, Ontario; Lake Nepigon; Selkirk 

 Mountains, B. C. 



372. Polytrichum commune minus Weiss. Plants shorter and more 

 slender: leaves dense, shorter and more erect; perichaetial bracts less dis- 

 tinct. Capsule much smaller and shorter, less acutely quadrangular, lid 

 with short straight beak; calyptra pale golden brown. Braithw. Brit. 

 Moss Flora 1 : 59. New Jersey. 



373. Polytrichum polare C. Mull. Dioicous: low, dendroid, every- 

 where dark green, below with closely appressed small scales, above 

 fastigiately branched; branches long for height of plants, rather slender, 

 again divided, flexuous, equal: stem leaves closely appressed, when moist 

 erect spreading, rather strict, from a large rbroadly-sheathing base obovate; 

 shortly lanceolate; costa broad, multilamellose, opaque, occupying whole 

 lamina, excurrent into a short blackish point ; margin strongly serrate 

 with robust teeth (rarely none) lobed at base and very sharp at apex; cells 

 elongate, very narrow, close, flexuous, yellow, at margin very slender 

 forming a pale border, above sinuate-narrowed; scales of undivided lower 

 stem quite entire or slightly dentate at base, very shortly lanceolate; peri- 

 chaetial leaves like; capsule on short thick red seta (scarcely 1 in.), in- 

 clined, small, quadrangular, bistrumose at base; teeth very narrow, whit- 

 ish. Bot. Zeit. 17: 205. 1859. Greenland. 



