Var. obscurata, Ach.

L'Anse au Mort, Labrador. (Waghorne.) Alpine rocks, Arctic America. (Herb. Hooker.) On rocks on Moose Mountain, alt. 6,000 feet, Rocky Mountains, July 2nd, 1897. (Macoun.) Islands of Behring Strait. (Wright)

Var. enteromorpha, Tuckerm.

Blanc Sablon, Labrador. (Waghorne.) Very abundant on trees around Victoria, at Nanaimo, Qualicum, and Comox, Vancouver Island; on trees at Hastings, Burrard Inlet, B.C.; on trees near McLeod's Lake, northern British Columbia. (Macoun.) On trees, Fort Rupert, Vancouver Island. (Dr. G. M. Dawson.) Chelliwack Valley, B.C. (J. M. Macoun.)

Var. vittata, Ach.

Bay Bull Arm, Trinity Bay and Goose Arm, Newfoundland. (Waghorne.) On spruce trees along Ste. Anne des Monts River, Gaspé Co., Que. (Macoun.) At Carmanah, near Cape Beale, Vancouver Island. (J. M. Macoun.)

61. P. encausta, (Smith) Nyl.

Alpine rocks, Greenland. (Vahl.) Labrador. (Waghorne.)

Var. alpicola, Nyl.

A blackened alpine condition.

Greenland. (Vahl.) Labrador. (Waghorne.)

62. p. colpodes, (Ach.) Nyl.

On Rigaud Mountain, Vaudreuil Co., Que. (Rev. G. Ducharme.) On trees, Central Ontario Junction, Hastings Co., Ont, Oct. 22nd, 1893; on trees, chiefly tamarac, in a swamp near Ottawa, Ont., and on trees, King's Mountain, Chelsea, Que. (Macoun.)

63 R olivacea, (Linn.) Ach.

Greenland. (Branth.) On trees, Arctic America. (Richardson.) On trees, Canaan Forks, Queen's Co., N.B. (J. Moser.) On Rigaud Mountain, Vaudreuil Co., Que. (Rev. G. Ducharme.) On alders at Baddeck and Big Intervale, and on rocks, Cape Breton Island, N.S., July, 1898; on alders, Ste. Anne des Monts River, Gaspé Co., Que.; rather common on bark of trees, especially alder, at Ottawa, Ont.; on trees, Nipigon River, Ont.; on trees along Jumping Pound Creek, Rocky Mountains, June, 1897; on trees at Morley, Jumping Pound Creek, and Kanan-askis, Rocky Mountains; on alder bushes, Revelstoke and Black-water River, and Hastings, Burrard Inlet, B.C.; on poflar trees, Sea's farm, Victoria, Vancouver Island. (Macoun.) Athabasca River. (J.M. Macoun)

Var. aspidota, Ach. On rocks, coast of Newfoundland, 1893. (Waghorne.) Var. prolixa, Ach.

On rocks, shores of Lake Nipigon, July, 1884; on rocks Spence's Bridge, B.C., May, 1889. (Macoun.)

Var. panniformis, Nyl.

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

Var. sorediata, (Ach.) Nyl.

On fence boards, Sable Island, N.S., 1899; Baddeck, Cape Breton Islan, N.S., 1898; on alders near Hull, Que., 1891, and on fence-rails, Rideau Park, Ottawa, Ont., 1887; on old cedar rails, Hastings Co., Ont., 1868; on fence-rails, Seymour West, Northumberland Co., Ont., 1893; on rocks near Galt, Ont.; in

Algonquin Park, Ont., 1900; on rocks, Cache Lake, Algonquin Park, Ont., July, 1900; on rocks, Nipigon River, Ont.; on rocks, Blackwater River, B.C.; on alders, Hastings, B.C., 1889. (Macoun.)

A form found on Alnus incana and on fences, with us, always infertile, is placed under var. sorediata because the specimens are more or less sorediate, with white powdery granules on the margins of the divisions of the thallus.

64. P. stygia, (Linn.) Ach.

Alpine and subalpine rocks.

Greenland. (Branth.) Arctic America. (Richardson.) Newfoundland. (Pylaie.) Labrador. (Waghorne.) On rocks, Ta-dousac, Que. (A. T. Drummond.) On rocks, Deer Park, Columbia River, B.C., 1890; on sandstone rocks along Jumping Pound Creek, Rocky Mountains, June, 1897. (Macoun.)

65. P. lanata, (Linn.) Wallr.

Greenland. (Branth.) Arctic America. (Richardson.) Melville Island. (R.Brown.) Labrador. (Waghorne.) On the summit of Mount Benson, alt. 3,000 feet, Nanaimo, Vancouver Island, July 10th, 1893. (Macoun.)

66. P. caperata, (Linn.) Ach.

Trunks, dead wood and stones, quite common.

On old rails, Canaan Forks, Queen's Co., N.B. (J.Moser.) Arctic America. (Richardson.) On trees, Tobique River, N.B. (G. U.Hay.) On Rigaud Mountain, Vaudreuil Co., Que. (Rev. G. Ducharme.) On old fences around Ottawa, Ont.; at Belleville, Brighton and Nipigon River, Ont.; on trunks at Jordan Station, Lincoln Co., Ont., May 17th, 1901; on basswood trees at Guelph, Ont., 1898; on trunks, Algonquin Park, Ont., 1900; on dead wood, Manitoba House, Man.; on dead wood at Morley, Rocky Mountains. (Macoun.) On board fences at Edmonton, Ont. (James White.')

67. P. conspersa, (Ehrh.) Ach.

On rocks and stones and sometimes on dead wood. Greenland. (Branth.) Arctic America. (Richardson.) Labrador. (Waghorne.) On rocks, Barren Grounds, Lat. 61 °, Long.

104o, W. (J• W. Tyrrell.) On rocks, Never's Rapids, Queen's Co., N.B. (J. Moser) On boulders, Carleton Co., N.B. (G. U. Hay.) On Rigaud Mountain, Vaudreuil Co., Que. (Rev. G. Ducharme.) Dry rocks, Stony Lake, Peterboro' Co., Ont. (Thos. Walker.) On boulders, Big Intervale, Margaree, Cape Breton Island, N.S., July, 1898; on boulders along Ste. Anne des Monts River, Gaspé Co., Que.; on boulders in woods around Ottawa, Ont.; very common in Algonquin Park, Ont., 1900; on rocks on Moose Mountain and in Crow's Nest Pass, Rocky Mountains; on rocks, Blackwater River, B.C.; on rocks and old logs, Deer Park, Columbia Valley. B.C.; on rocks at Hastings, Burrard Inlet. B.C.; on rocks, Burnside Road, Victoria, Vancouver Island. (Macoun)

68. p. molliuscula, Ach.

Not uncommon on earth in the southern parts of the prairie region from Manitoba to the Rocky Mountains; on earth at Old Wives Creek, Assa.; in the Bow River Pass at Morley, and by the lake in the Crow's Nest Pass, Rocky Mountains. (Macoun.)

69. P. centrifuga, (Linn.) Ach.

Alpine and subalpine rocks.

Greenland. (Branth.) Arctic America. (Vahl.) Digge's Island, Hudson Strait. (Dr. R. Bell.) Blanc Sablon, Labrador. (Waghorne.) Clearwater Lake, Labrador, July, 1896; Summit Lake, Manicouagan River, Que, 1895. (A. P. Low.) Newfoundland. (Despreaux.) Tobique River, N B. (G. U. Hay.) On rocks, Ta-dousac, Que. (Drummond.) On Rigaud Mountain, Vaudreuil Co., Que. (Rev. G. Ducharme) Along the northeast coast of Lake Superior, and along Nipigon Lake and river. (Macoun.) North shore of Lake Superior. (Agassiz)

10. p. incurva, (Pers.) Fr.

On granitic rocks, alpine and arctic. Greenland. (Branth) Labrador. (Waghorne)

71. P. ambigua, (Wulf.) Ach.

On trunks, dead wood and rocks.

Greenland. (Arct. Man) Arctic America. (Richardson.) Trinity Bay, Newfoundland. (Waghorne.) On dead spruce logs at the

Big Intervale, Margaree, Cape Breton Island, N.S., July, 1898; on dead bark at Banff, Rocky Mountains; on dead logs, Jumping Pound and Bragg's creeks, Rocky Mountains, June, 1897; on old logs, Deer Park, Lower Arrow Lake, B.C.; on dead pine logs, northern British Columbia. (Macoun.)

Var. albescens, Wahl.

Greenland. (Arct. Man.) Birchy Cove and Eagle River, Newfoundland. (Waghorne.) On old logs and rails, Big Intervale, Margaree, Cape Breton Island, N.S., July 22nd, 1898. (Macoun.)