48. M. emarginata, (Ehrh.) Dumort.

Miquelon Island, Gulf of St. Lawrence. (Delaware.) Labrador. Collected by Waghorne. (Underwood.) On wet ground in a gully at Canaan Forks, Queen's Co., N.B. (J.Moser.) On wet rocks by a brook, Margaree and Half-Way Brook, Cape Breton Island, Aug., 1898; on earth in bogs at Banff, Rocky Mountains; on stones in a brook, Roger's Pass, Selkirk Mountains, B.C.; on stones and wet earth on mountains north of Griffin Lake, B.C.; on rocks at Yale, Fraser River, B.C.; on damp rocks, North Arm, Burrard Inlet, B.C.; on rocks at Goldstream, near Victoria, Vancouver Island; on rocks, Mount Benson, near Nanaimo, Vancouver Island, alt. 3,000 feet, June 8th, 1887; on rocks,Mount Mark, near Qualicum, Vancouver Island, alt. 3,000 feet; on wet rocks, Mount Erskine, Salt Spring Island, Gulf of Georgia, B. C; on earth at Nanaimo, Vancouver Island, June 4th, 1887. (Macoun.) Attu Island, Behring Sea. (J. M. Macoun.) Port Wells, Columbia Fiord, Unalaska and Juneau, Alaska. (Evans.) Sheep Camp, Alaska, and on rocks above Long Lake, B.C., 1898. (Williams.)

Var. aquatica, Pearson. Newfoundland. (Pearson.) This may be M. aquatica, Schiffner.

49. M. sphacelata, (Grisecke) Dumort.

Miquelon Island, Gulf of St. Lawrence. (Delaware.) On wet rocks, Half-Way Brook, Cape Breton Island, N.S., Aug., 1898; on wet rocks near the lighthouse at Yarmouth, N.S., June 23rd, 1883; on wet rocks in brooks, mountains north of Griffin Lake, Gold Range, B.C. (Macoun.) Chilcat, Alaska. (Krause.)

50. M. sparsifolia, (Lindb.) Dumort.

On wet rocks at Nanaimo, Vancouver Island, June 4th, 1887; on rocks, Mount Arrowsmith, Vancouver Island, alt. 4800 ft, July 17th, 1887. (Macoun.)

51. M. densifolia, (Nees) Dumort.

On stones in brooks, on the mountains north of Griffin Lake, Gold Range, B.C., Aug., 7th 1889. (Macoun.)