In small, fragile, olive-green tufts on granitic and other metamorphic rocks across the continent. Truro, N.S.; Sudbury Junction, Lake Superior and Lake Nepigon, Ont.; Hector, Rocky Mountains; Roger's Pass, Selkirk Mountains, and on the Gold Range at Griffin Lake, B.C.; Mounts Benson and Arrowsmith, Vancouver Island. (Macoun.) Smith's Sound. Lat. 78 - 82°. (Br. Hayes.) Jakobshavn, Greenland. (R. Brown.)
A. petrophila, Ehrh. var. alpestris, Thed.; Braithw. Brit. Moss-Fl. I. 8.
Differs from A. petrophila in the tufts being black and somewhat glossy in the dry state, the leaves smaller, less distinctly papillose, when dry closely imbricated, the upper leaf cells one-half smaller.
New to America. On damp rocks, North West Arm, Halifax, N.S., June 18th, 1883. (Macoun.) Christianshaab, Greenland. (Fl. Gr.)
(30.) A. Huntii, Limpr. Laubm. Deutschl. 145.
Differs from A. crassinervis principally in the subula of the leaf, only about a half formed by the costa, and the very papillose perigonial and perichetial leaves, also in the larger capsule.
This species is often confounded with A. Rothii, Web. & Mohr. On rocks, Mount Arrowsmith, Vancouver Island. Alt. 5,500 feet. July 18th, 1887. (Macoun.) New to America.
(31.) A. Obovata, Thed.; Greenland Flora, 399. Disco Island, Greenland. (Fl. Gr.)
(32.) A. Blyttii, Schimp.; Greenland Flora, 400. Jakobshavn, Greenland. (Fl. Gr.)
(33.) A. crassinervia, Bruch; Lesq. & James Mosses of N. America, 26.
Greenland. Godhavn. (Fl. Gr.)
Stem elongate, about 5 c. m. high. Tufts soft well cohering, dark brown or brick-red, not glossy. Leaves narrow from the broader base suddenly long acuminate, distinctly but faintly papillose, more or less curved, the uppermost falcate, when dry subcrispate; cells uniform subquadrate; costa narrow, linear, nearly smooth, in the upper leaves long-excurrent and denticulate, sometimes to the middle. Dioecious.
This lovely species is closely allied to the European A. nivalis, Hook.; but the leaves are narrower and very much less papillose, principally on the stouter, more defined, purple-red and often excurrent costa.
In cushions and flat mats on the inclined faces of rocks on the mountains and by brooks flowing from perpetual snow on the Gold Range north of Griffin Lake, B.C. Alt. 1,500 feet. August 8th, 1889. (Macoun.)
(35.) A. parvifolia, C. Muell. Flora, (1887) 14. Alaska. (Both. Alask.)