BARNES — NORTH AMERICAN MOSSES. 285 



172. Griinmia elatior B. &S. — Dioicous: robust, 4-6 cm.: stems erect, 

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

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

 revolute. 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 arcualifolia 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: perichastial 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: perichastial 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 Arizonse Ren. & Card.— Differs from O. trichophylla 



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