BARNES NORTH AMERICAN MOSSES. 285 



172. Grimmia elatior B. & S. Dioicous: robust, 4-6 cm.: steins erect, 

 naked at base, slightly branching, in broad lax tufts of a yellowish green 

 color, brown in interior: leaves erect, lanceolate, concave carinate, borders 

 re volute, hair point long and nearly smooth; basal cells rectangular, marg- 

 inal scarcely distinct, upper round quadrate, more or less papillose; costa 

 strong: perichaetial leaves large, erect, laxly areolate: seta arcuate; cap- 

 sule oval, striate, when dry sulcate; lid conic, straight; annulus large, com- 

 pound (3): teeth broadly subulate, purple, densely articulate, irregularly 

 cleft and perforated. Braithw. Brit. Moss Flora 2: 23. Godhavn, Green- 

 land. On rocks: Rocky Mountains. 



173. Grimmia arcuatifolia Kindb. Loosely tufted, tufts blackish, 

 dark green above: stems 5 cm. long, denudate at base: lower leaves small, 

 upper long and not crisped, hooked-curved when moist, ovate lanceolate, 

 long acuminate and acute, reflexed at least at one border, with a short 

 denticulate hair point; most basal cells pellucid, long, narrow, upper basal 

 cells sinuous, marginal uniseriate, hyaline or not distinct; other cells 

 chlorophyllose, quadrate, not sinuous; costa percurrent, canaliculate, pel- 

 lucid in the middle. Mac. Cat. 69. On dry rocks: Vancouver Island. 



174. Grimmia Hartmani Sch. Dioicous: tufts large, lax, dense- 

 leaved, yellowish or olive green above, dark at base: stems 3-10 cm., pro- 

 cumbent, naked at base: leaves often more or less secund, erect spreading 

 when moist, slightly crispate when dry, oblong lanceolate, upper ending in 

 a slightly denticulate hair, carinate, revolute at border, sometimes only 

 on one side; lower marginal cells quadrate, distinct, cells near costa rec- 

 tangular, upper roundish-quadrate; young terminal leaves tipped with 

 globose propagula, formed of quite a number of cells, or occasionally bifur- 

 cate: perichaetial leaves shorter, from a longish concave base, lanceolate, 

 pointed, with laxer more transparent cells: capsule longish oval-oblong, 

 smooth; seta erect or curved; annulus of three to four rows of small cells; 

 calyptra mitriform, lobed; teeth lanceolate, entire or slightly perforated, 

 orange red, smooth at the base. Husnot, Muse. Gall. 135. Summits of 

 Chilco Range, Idaho. 



175. Grimmia depilata Kindb. Tufts large and compact, brown or 

 green above: stem elongate: leaves when moist arcuate, ovate lanceolate, 

 recurved on both sides, generally hairless and obtuse, sometimes with a 

 short hair point; alar cells hyaline, elongate, in 4-5 rows, the others more 

 or less erose: perichaetial leaves from a sheathing base narrowed into a 

 large canaliculate sublinear and obtuse acumen: capsule nearly smooth, 

 when dry finally rugose, not distinctly costate; teeth red, deeply cleft be- 

 low middle, when dry spreading, connivent when moist; beak more or less 

 oblique: pedicel arcuate when dry. Mac. Cat. 69. Vancouver Isl., alt. 

 3,000 feet. 



176. Grimmia Arizona Ren. & Card. Differs from G. trichophylla 



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