88. U. rugifera, Nyl.

Greenland. (Giseke.) Labrador. (Waghorne.) On rocks, Una-laska Island, Behring Sea, 1891, and abundant on St. Paul and St. George islands, Behring Sea, July, 1897. (J. M. Macoun.)

89. U. cylinirica, (Linn.) Delis.

High alpine and arctic rocks.

Greenland. (Vahl.) Labrador. (Herb. Schwein.) Labrador. (Waghorne.) Newfoundland. (Despreaux.) Digge's Island, Hudson Strait; a small piece. (Dr. R. Bell.) Bear Lake. (Herb. Hooker.) On rocks, Moose Mountain, near the source of the Elbow River, Rocky Mountains, July 1st, 1897, alt 6,500 feet. (Macoun.) Very fine specimens were gathered on St. Paul and St. George islands, Behring Sea, in July, 1897, by Mr. J. M. Macoun.

90. U. proboscidea, (Linn.) Stenh.

Alpine rocks, Greenland. (Vahl.) Arctic America. (Richardson.) Digge's Island, Hudson Strait; also on Baffin Land, 1897. (Dr. R. Bel/.) Battle Harbor and Sampson's Island, Labrador. (Waghorne.) Newfoundland. (Despreaux.) Summit of Mount Albert, Gaspé Co., Que.; on rocks, Moose Mountain, alt. 6,500 feet, Rocky Mountains; on rocks, Mount Benson, Nanaimo, Vancouver Island. (Macoun.) North shore of Lake Superior. (Agassiz.) St. Paul, St. George and St. Lawrence islands, Beh-ring Sea. (J. M. Macoun.) St. Matthew Island, Alaska. (Rothrock.)

Var. arctica, Ach.

On rocks, Greenland. (Vahl.) Labrador. (Waghorne.) Newfoundland. (Despreaux.) Summit of Mount Benson, alt. 3,000 feet, Nanaimo, Vancouver Island. (Macoun.)

91. U. anthracina, (Wulf.) Schaer.

On rocks, Greenland. (Vahl.) Labrador. (Waghorne.) Newfoundland. (Despreaux.) On rocks, summit of Mount Benson, near Nanaimo, Vancouver Island. (Macoun.)

Var. reticulata, Schaer.

Arctic America. (R. Brown.) On Nottingham Island, Hudson Strait, 1884. (Dr. R. Bell.)

92. U. polyphylla, (Linn.) Hoffm.

Alpine rocks, descending towards the north.

Greenland. (Vahl.) Labrador. (Waghorne.) Newfoundland. (Despreaux.) On rocks along Nipigon River and Lake; on rocks near the "Gap," Crow's Nest Pass, 1897; on rocks, Deer Park, Lower Arrow Lake, Columbia River, B.C.; on rocks, Pier's farm, Victoria, Vancouver Island. (Macoun.) Mount Queest, Gold Range, B.C. (J. M. Macoun.) Unalaska Island, Alaska. (Rothrock.

Var. deusta, (Linn.) Fr. Grand Lake, Bay of Islands, Newfoundland. (Waghorne.)

93. U. flocculosa, Hoffm.

Alpine rocks, descending to lower altitudes towards the north.

Greenland. (Arct. Man.) Bolster Rocks, Newfoundland. (Wag-horned) On rocks, along Half-Way Brook, Cape Breton Island, N.S., Aug., 1898; rather common on rocks at Câche Lake, Algonquin Park, Ont., July, 1900; on rocks, Nipigon River; on rocks at Sproat, Columbia River, B.C., 1890. (Macoun.) Rocky Mountains. (Herb. Hooker.) Behring Strait. (Wright.)

94. U. hyperborea, Hoffm.

On rocks, Greenland, 1884. (Warming & Holm.) Arctic America. (Richardson.) On rocks, Cape Chudleigh, Hudson Strait; also on Baffin Land, 1897. (Dr. R. Bell.) On rocks, Clearwater Lake, northern Labrador, 1897. (A. P. Low.) Labrador. (Waghorne.) Newfoundland. (Despreaux.) On gneiss rocks, Tadousac, Que. (A. T. Drummond.) On rocks along Jupiter River, Anticosti, Que.; on rocks, northeast coast of Lake Superior; on rocks, Moose Mountain, alt. 6,500 feet, and Crow's Nest Pass, Rocky Mountains; on rocks, Deer Park, Lower Arrow Lake, Columbia River, also at Lytton on Fraser River, B.C.; on rocks, summit of Mount Benson, near Nanaimo, Vancouver Island. (Macoun.) North shore of Lake Superior. (Agassiz.) Rocky Mountains. (Herb. Hooker.) Harbledown Island, Gulf of Georgia, B.C. (Dr. G. M.Dawson.)

95. u. phaea, Tuckerm.

On rocks, Parson's Mountain, near Victoria, Vancouver Island, May 17th, 1893. (Macoun.)

'96. U. erosa, (Web.) Hoffm.

Alpine rocks, descending towards the north. Greenland. (Arct. Man.) Arctic America. (R. Brown.) Labrador. (Wag-home.) Newfoundland. (Despreaux.) On gneiss rocks, Tadousac, Que. (A. T. Drummond.) Summit of Mount Albert, Gaspé Co., Que.; on rocks, Deer Park, Lower Arrow Lake, Columbia River, B.C. (Macoun.) On rocks, St. George Island, Behring Sea, June 10th, 1897. (J. M. Macoun.)

97. U. Muhlenbergii, (Ach.) Tuckerm.

Arctic America. (Richardson) On rocks, Clearwater River, northern Labrador, July, 1896. (A. P. Low.) L'Anse au Clair, Labrador; Notre Dame Bay, Newfoundland. (Waghorne) On rocks, Barren Grounds, Lat. 61°, Long. 1040, W. (J. W. Tyrrell) On gneiss rocks, Tadousac, Que. (A. T. Drummond) Granitic rocks, Nova Scotia. (J. Moser.) On rocks, Tobique River, N.B. (G. U. Hay.) On rocks, Jupiter River, Anticosti; at Halifax, N.S.; on rocks, mouth of Rideau River, near Ottawa, Ont.; on rocks at Kingsmere, near Chelsea, Que.; on rocks, Paugan Falls, Gatineau River, Que.; on Britton's Island, Gull Lake, Victoria Co., Ont.; quite common on rocks in Algonquin Park, Ont., July, 1900; at Otter Head, Lake Superior. (Macoun.) Kingston Mills, Ont., 1901. (J. M. Macoun.) Granite rocks, Stony Lake, Peterboro' Co., Ont. (Thos. Walker) On rocks, Savanne, west of Lake Superior, Oct., 1893. (Lawson)

98. U. vellea, (Linn.) Nyl.

On rocks on high mountains.

Greenland. (Arct. Man.) Labrador; Shoal Point, Newfoundland. (Waghorne.) Newfoundland. (Despreaux.) On the face of a perpendicular cliff, King's Mountain, west of Chelsea, Que., May, 1897; very abundant on rocks, Cache Lake, Algonquin Park, Ont, June, 1900; on rocks, Lake Nipigon, Ont.; on rocks, Crow's Nest Pass, alt. 4,000 feet, Rocky Mountains; three miles below Hector, Rocky Mountains; at Pass Creek, Sproat's Landing, Columbia River, B.C.; Lake Mara, Sicamous, B.C.; on rocks, Moose Mountain, alt. 6,000 feet. (Macoun) North shore of Lake Superior. (Agassis)

99. U. Dillenii, Tuckerm.

Newfoundland. (Tuckerman) On rocks, Tobique River, N.B. (G. U. Hay) North shore of Lake Superior. (Agassiz.) On the faces of perpendicular rocks, King's Mountain, west of Chelsea, Que., May, 1897; quite common on rocks, Câche Lake, Algonquin Park, Ont., June, 1900; on Britton's Island, Gull Lake, Victoria Co., Ont.; on rocks, northeast coast, Lake Superior. (Macoun) On Rigaud Mountain, Vaudreuil Co., Que. Rev. G. Ducharme.

100. U. angulata, Tuckerm.

On rocks on the Pacific Coast.

Observatory Inlet, B.C. (Herb. Hooker.) On rocks, Parson's Mountain and Pier's farm, near Victoria, and on the summit of Mount Benson, Nanaimo, Vancouver Island, B.C. (Macoun.) On rocks, Chilliwack Valley, B.C. (J. M. Macotm.)

101. U. Pennsylvanica, Hoffm.

Greenland. (Arct. Man.) Arctic America. (Richardson fide Tuckerman.) Labrador. (Waghorne.)

102. U. pustulata, (Linn.) Hoffm. var. papulosa, Tuckerm.

Newfoundland. (Despreaux.) On rocks, Jupiter River, Anti-costi; on dry rocks, Britton's Island, Gull Lake, Victoria Co., Ont.; Otter head, northeast coast of Lake -Superior; very abundant on rocks, Algonquin Park, Ont., July, 1900. (Macoun.) On Rigaud Mountain, Vaudreuil Co., Que. (Rev. G. Ducharme.)

103. U. hirsuta, (Ach.) Stenh. var. grisea, Fr.

Greenland. (Branth.) Newfoundland. (Despreaux.) Notre Dame Bay, Newfoundland Waghorne.) On rocks, Tadousac, Que. (A. T. Drummond.)

104. U. spodochroa, Hoffm.

Greenland. (Arct. Man.) On sea cliff, Osprey Beach, Bay of Islands, Newfoundland, July 2nd, 1895. (Waghorne.)