A common species on rocks, both dry and wet, at Baddeck, Margaree, Louisburg, and Half-way Brook, Cape Breton Island, N.S., July, 1898; on rocks, Cache Lake, Algonquin Park, Ont., June, 1900. (Macoun.) Summit Lake, Manicuagan River, Eastern Quebec, July, 1895. (A. I. Low.) Common about Lake Lindeman, Yukon, May 17th, 1899, in fine fruit. (Williams.)
Var. acuminata. Schimp.
Lake Lindeman, Yukon, 1899; all the specimens examined seemed to be dioiceous. (Williams.)
Var. parvifolia, (Mull.) Williams. Sheep Camp, Dyea Creek, Alaska, 1899. (Williams.)
Subsp. sublaevis, Kindb. Europ. & Am. Mosses, Pt. II., 393.
Leaves small, distant, spreading, generally nearly smooth; perichetial leaves generally acute, long-acuminate. Tufts low, blackish brown.
On rocks, Carmanah Point, south coast of Vancouver Island, May 9th, 1892. (J. M. Macoun)
33. A. crassinervis, Bruch.
On rocks, northern Newfoundland. (Waghorne)
958. A. Rothii, Web. & Mohr., Subsp. falcata, Schimp.
On rocks, Parson's Mountain, near Victoria, Vancouver Island, May 19th, 1893. (Macoun)
959. A. obtusifolia, Berggren.
On rocks, Greenland. (Berggren.)