(343.) O. Ohioense, Sulliv.& Lesq.; Lesq. & James, Mosses of N. America, 170.

O. psilocarpum, Canadian Musci., No. 123, in part.

On trees at Bass River, Kent Co., N.B. (Fowler's Cat.) On trees, Cove Head, Prince Edward Island; on trunks at Ottawa, Belleville and Owen Sound, Ont. (Macoun.) On trees, Canaan Forks, Queen's Co., N.B. (J. Moser.)

(344.) O. Schimperi, Hamm.

0. fallax, Schimp.; Lesq. & James, Mosses of N. America, 171.

Not uncommon on trees at Ottawa; on fence rails at Carleton Place and on trees on Massassagua Point, Bay of Quinte, Ont. (Macoun.)

(345.) O. brachytrichum, Schimp.; Lesq. & James, Mosses of N. America, 172.

0. obtusifolium, Drumm. Musc. Bor. - Am., No. 157.

Upon trees in the country extending from Upper Canada (Ontario), to the Rocky Mountains. (Drummond.)

I believe Drummond's specimen to be really 0. obtusifolium.

(346.) O. strangulatum, Beauv.; Lesq. & James, Mosses of N. America, 172; Canadian Musci, No. 124.

On trees at Bass River and Fredericton, N.B. (Fowler's Cat.) On trees at Cove Head, P.E.I.; also at Pictou, N.S.; on trees in woods around Ottawa; at Belleville and Owen Sound, and also at Lake Nepigon, Ont. (Macoun.) On poplar trees at Pictou, N.S. (McKay.)

(347.) O. tenellum, Bruch; Lesq. & James, Mosses of N. America, 172.

On trees at London, Ont., 1889. (J. Dearness.)

(348.) O. consimile, Mitt.; Lesq. & James, Mosses of N. America, 173.

On trees, Vancouver Island. (Lyall.) We are not acquainted with this species.

(349.) O. lonchothecium, C. M. & Kindb. (n. sp.)

Differs from Orthotrichum speciosum in the capsule being shorter than the pedicel, when moist, and the calyptra narrower; the peristome erect when dry, the cilia of one row of cells.

On trees at the mouth of Krao Creek, KootanieLake, B.C., July 13th, 1890; also on trees at Banff, Rocky Mountains, 1891. (Macoun.)

(350.) O. Roellii, Vent. Bot. Can., 51 (1890), 6. (n. sp.)

0. lonchothecium, Canadian Musci, No. 497. On rocks, Fort Chipweyan, Lake Athabasca, N.W.T.; on rocks at Yale, B.C., May 17th, 1875; also on rocks, Deer Park, Lower Arrow Lake, Columbia River, B.C. (Macoun.)

(351.) O. psilothecium, C. M. & Kindb. (n. sp.)

Plants small, 1 cm. long or less, green. Leaves short oblong-lanceolate, obtusate or short-acuminate, sub-obtuse, revolute at the borders to the greater part, faintly papillose; costa percurrent. Capsule small, immersed, oblong not striate before sporosis, very short-necked; vaginula naked; calyptra slightly hairy at the blackish apex, finally glabrous and light-brown, narrow, covering the whole capsule; lid rostellate. Male flowers on distinct branches.

This species has the habit of Orthotrichum fallax, Schimp. (0. Schimperi, Hamm.) We have not been able to examine the peristome and the stomata of the capsule, because only one capsule (in our specimens) is nearly ripe, the others are quite unripe.

On old fences along the Richmond Road, and near Bockcliffe,Ottawa; also on old fences at Carleton Place, August 26th, 1889. (Macoun.)

(352.) O. cylindrocarpum, Lesq.; Lesq. & James, Mosses of N. America, 173.

On rocks at the "Gap," Bow River Pass, Rocky Mountains. (Macoun.)

(353.) O. psilocarpum, James; Lesq. & James, Mosses of N. America, 173.

On trunks of trees on Pelee Point and Pelee Island, Lake Erie. (Macoun.)

(354.) O. leiocarpum, Bruch & Schimp.; Lesq. & James, Mosses of N. America, 174.

0. striatum, Drumm. Musc. Bor. - Am., No. 154.

Upon trees in Upper Canada (Ontario), and about Lake Superior. (Drummond.) Lake Superior. (Agassiz.)

(355.) O. pallens, Bruch; Lesq. & James, Mosses of N. America, 175.

Pack River, British Columbia. (Lyall.)

(356.) O. pulchellum, Brunton Lesq. & James, Mosses of N. America, 175; Canadian Musci, No. 127.

O. consimile, Canadian Musci, Nc. 125.

0. Columbicum, Mitt. Journ. Linn. Soc., VIII., 24.

On trees, Vancouver Island. (Lyall.) On trees, quite common at Victoria, Nanaimo and Comox, Vancouver Island; also on trees both sides of Burrard Inlet, B.C. (Macoun.) Coal Harbor, Alaska. (Harrington.)

(357.) O. canum, Mitt.; Lesq. & James, Mosses of N. America, 176; Mitt. Journ. Linn. Soc, VIII., 26.

British North America. (Drummond.)

(358.) O. obtusifolium, Schrad.; Lesq. & James, Mosses of N. America, 177; Canadian Musci, No. 128.

British America. (Drummond.) On trees at Canaan Forks, Queen's Co., N.B. (J. Moser.) On poplar trees, Bass River and Fredericton, N.B. (Fowler's Cat.) On poplar trees at Kingston, N.S.; on same species of trees, Cove Head, P.E.I.; also at the mouth of Madeline River, Gaspé Co., Que.; on old rails and poplar trees at Ottawa, Belleville, Owen Sound, Lake Nipissing, and at Lake Nepigon, Ont.; on poplar trees, Kananaskis River, Rocky Mountains; also along Eagle River at Sicamous, B.C.; on trees at McLeod's Lake and along Peace River, Lat. 56°, B.C. (Macoun.) On trunks at London, Ont. (J. Dearness.)

(359.) O. Jamesianum, Sulliv.; Lesq. & James, Mosses of N. America, 177.

On rocks at Fort St. James, Northern British Columbia, and on rocks at Yale, and Spence's Bridge, B.C. (Macoun.) Doubtful specimens from Bow River Pass, Rocky Mountains.

(360.) O. Lyellii, Hook. & Tayl.; Lesq. & James, Mosses of N. America, 177; Canadian Musci, No. 130.

Very common on trees in many parts of Vancouver Island, especially on oak trees; on trees at Hastings, Burrard Inlet, B.C., 1889. (Macoun.)

Var. papillosum, Lesq. & James, Mosses of N. America, 178; Canadian Musci, No. 464.

Quite common on trees in the vicinity of Victoria, Vancouver Island, 1887. (Macoun.)

Var. Pringlei, C Muell.

On rocks at Lytton, B.C., April 17th, 1889. (Macoun.)

(361.) O. Canadense, Bruch & Schimp.; Lesq. & James, Mosses of N. America, 171.

Drummond's Rocky Mountain Collection, Nos. 149 and 151.