(160.) D. rubellus, Bruch & Schimp.; Lesq. & James, Mosses of N. America, 104; Canadian Musci, No. 63.

Weissia curvirostra, Drumm. Musc. Bor. - Am., No. 71.

Very common in the country extending from Canada to the Rocky Mountains. (Drummond.) On the ground, Truro, N.S. (Fowler's Cat.) On rocks and earth, Tobique River, N.B. (Hay.) On rocks, Canaan Forks, Queen's Co., N.B. (J. Moser.) On rocks, South West Point, Anticosti; rocks at Campbellton, N.B.; on rocks, Truro, N.S.; on damp rocks, GaspÚ Co., Que.; on rocks, McKay's woods, Ottawa, at Belleville, Owen Sound, Port Dover and Niagara Falls, Ont.; on rocks at Kakabeka Falls, Kaministiquia River, Lake Superior; on earth, Lake Winnipegoosis, Man.; on rocks, Cypress Hills, Alberta; rocks at Morley, Banff and Hector, Rocky Mountains; at Revelstoke, Deer Park and Sproat, Columbia River; at Spence's Bridge and Lytton, B.C.; and frequent on Vancouver Island. (Macoun.) Jakobshavn, Greenland. (B. Brown.) Near London, Ont. (J. Dear-ness.)

(161.) D. Canadensis, Kindb. (n. sp.)

Differs from D. rubellus principally in the perichetial leaves being thinner, from the ovate base, abruptly attenuate to a short subulate acumen; borders not reflexed; basal cells very long; costa thinner. Dioecious.

On perpendicular rocks, head of Lake Louise, Rocky Mountains, Aug. 18th, 1891. (Macoun.)

(162.) D. luridus, Hornsch.; Lesq. & James, Mosses of N. America, 104; Canadian Musci, No. 64.

D. trifarium, Drumm. Musc. Bor. - Am., No. 120.

About the Falls of Niagara. (Drummond.) Abundant on limestone ledges and great boulders at Jones Falls, near Owen Sound; on limestone boulders below the Clifton House, Niagara Falls; on rocks at Hector, Rocky Mountains. (Macoun.)

(163.) D. rufus, Lorentz; Greenland Flora, 384. Greenland. (Fl. Gr.)

(164.) D. cylindricus, (Bruch.)Bruch & Schimp.; Lesq. & James, Mosses of N. America, 105.

On rocks at Wiarton, Bruce Co., Ont. (Macoun.) Godhavn, Green-land. (Fl. Gr.) Miquelon Island. (DelÓmare.)

160. D. rubellus, (Hoffm.) Bruch & Schimp.

On earth and rocks, Half Way Brook, Cape Breton Island N.S., Aug., 1898; on rocks, Moose Mountain, Rocky Mountains Alta., June, 1897; in a ravine at Woodstock, N.B., July, 1899. (Macoun.) Canon City, Dyea Creek, Alaska; also common at Dawson, Yukon, 1899. (Williams.)

161. D. Canadensis, Kindb.

Newfoundland. (Waghorne.)

989. D. Subruber, Kindb. Revue Bryol. 1896.

Leaves as in D. rubellus, but often dentate. Perichetial leaves long-subulate, not recurved. Capsule curved; lid rostrate. Dioecious.

On rocks at Morley, Banff and "Dry Canon," Devil's Lake, Rocky Mountains, Alta., Aug. 11th, 1891. (Macoun.)

162. D. luridus, Hornsch.

On damp limestone rocks, Credit Forks, Ont., Sept., 1892. (Jas. While.)

990. D. trachyneuron, Kindb. Bryol. N. Am. & Eur. 275.

Leaves short-attenuate, subacute, brittle; costa pale, papillose at the back, sometimes excurrent. Tufts low, green. Capsules unknown.

On a large rock in a ravine at North Wakefield, Que., Sept. 12th, 1893. (J. M. Macoun.) On rocks at Owen Sound and Wiarton, Bruce Co., Ont, July, 1874. (Macoun.)

(160.) D. rubellus, Bruch & Schimp.

Rocky Mountain Canon, Peace River, lat. 56°. (Macoun.) Clearwater River, near its confluence with the Athabasca, N.W.T. (J. M. Macoun.) White Bay, Newfoundland. (Rev. A. Waghorne.)

(939.) D. Baden-Powelli, Kindb. Ott. Nat. Vol. V. 179.

Differs from Didymodon rubellus in the dioecious inflorescense, the blunt, conic, very short lid, scarcely 1-5 of the capsule, and the distinctly dentate leaves (as in Didymodon alpigenus, Vent). The tufts are compact, about 2 cm. high, the leaves revolute nearly all around, short-acuminate the lower pale-brown; the perichetial ones longer acuminate or subulate, entire; the capsules are (unripe) more or less curved, the pedicel pale-red.

St. Paul Island, Behring Sea, August 3rd, 1891. (J. M. Macoun.)