151. D. albicans, (Linn.) Trevis.
Miquelon Island, Gulf of St. Lawrence. (DelÓmare.) On earth at Pictou, Nova Scotia, July 24th, 1883; crevices of wet rocks,
Margaree and Half-Way Brook, Cape Breton Island, N.S., 1898; on damp rocks in a ravine, Woodstock, N.B., July, 1899; on rocks northeast coast of Lake Superior, July 27th, 1869; on rocks, Roger's Pass, Selkirk Mountains, B.C.; on rocks, Mount Benson, Nanaimo, Vancouver Island; near the summit of Mount Arrow-smith, alt. 5,500 feet, Vancouver Island. (Macoun.) Rocky Mountains. (Bourgeau.) Queen Charlotte Islands, B.C. (Law.) St. Paul Island, Behring Sea, and Carmanah, west coast of Vancouver Island, 1892. (J. M. Macoun) Hot Springs, Mount Ver-stovia, Orca, Columbia Fiord, Port Wells, Farragut Bay and Barlow Cove, Alaska. (Evans.)
152. D. taxifolia, (Wahl.) Trevis.
Labrador. Collected by Waghorne. (Underwood.) On moss and rocks, Pirate's Cove, Canso, N.S., July 9th, 1883; wet rocks, Smoky Mountain and Half-Way Brook, Cape Breton Island, N.S., 1898; on rocks, Ste. Anne des Monts River, GaspÚ Co., Que.; on rocks, Burnt Portage, Dawson Route, west of Lake Superior, July 24th, 1872; on wet rocks at Revelstoke, Columbia River, B.C.; mountains of the Gold Range, north of Griffin Lake, B.C.; on rocks at Peace River Canon, Lat. 56o 12', Oct. 24th, 1872; on rocks, Mount Benson, and in brooks, Nanaimo, Vancouver Island. (Macoun.) On damp rocks, Carmanah, west coast of Vancouver Island, 1892, and on St. Paul Island, Behring Sea, 1891. (J. M. Macoun.) St. Matthew Island, Unalaska Island, Cape Nome and Sitka, Alaska. (Evans.) On rocks, Canon City, Alaska, March 27th, 1898. (Williams.) Unalaska. (Chamisso.)
153. D. argentea, (Tayl.)
Observatory Inlet, northwest coast of America. (Dr. Scouler.) Northwest coast of America, 1791. (Menzies) Forward Bay, Johnston's Strait, Gulf of Georgia, B.C., 1885. (Dr. G. M. Dawson)
154. D. obtusifolia, (Hook.) Trevis.
On earth under stumps at Hastings, Burrard Inlet, B.C., April nth, 1889; on earth under a stump in woods, at Revelstoke, Columbia River, B C. (Macoun.)
155. D. plicata, (Lindb.) Evans.
Orca, Farragut Bay and Hall Island, Alaska. (Evans.)