254. P. bryontha, (Ach.) Nyl.

On earth, growing over mosses, in alpine and northern districts.

Greenland. (Vahl.) Growing over mosses, L'Anses au Mort, Labrador. (Waghorne.) Shores of St. Mary's River, Lake Superior. (Richardson) Islands of Behring Strait. (Wright.)

255. P. velata, (Turn.) Nyl.

On trees, rails and rocks.

Labrador or Newfoundland. (Waghorne fide Eckfeldt) On trunks at Baddeck and Margaree, Cape Breton Island, N.S., July, 1898; quite common on trunks and rails in many localities around Ottawa, Ont.; on bark of trees at Belleville, Hastings Co., Ont.; on fence-rails, Central Ontario Junction, Hastings Co.; at Brighton, Northumberland Co., Ont.; on trunks, Queenston Heights, Ont., May 9th, 1901. (Macoun.) On bark, Rigaud Mountain, Vaudreuil Co., Que. (Rev. G. Ducharme.) On beech trunks at Edmonton, Ont. (James White.)

256. P. panyrga, (Ach.) Th. Fr.

On the earth running over mosses in alpine and northern districts.

Greenland. (Vahl.) Labrador or Newfoundland. (Waghorne fide Eckfeldt.) On moss on rocks, St. Paul Island, Behring Sea, July, 1897. (J. M. Macoun)

257. P. multipuncta, (Turn.) Nyl.

On trees or more rarely on rocks.

Labrador or Newfoundland. (Waghorne fide Eckfeldt.) Quite common on trunks, chiefly birch, at Baddeck and Margaree, Cape Breton Island, N.S., July, 1898; on trees at Truro, N.S.; on spruce trees, Anticosti, Que.; on ash trees, Ste. Anne des Monts River, Gaspé Co., Que.; on maple, cedar and other trees, common at Ottawa,Ont.; on trees at Belleville, Hastings Co., Ont.; on trees, Algonquin Park, Ont., June, 1900; at Sudbury Junction, Ont.; on poflar trees along Jumping Pound Creek, Rocky Mountains, June, 1897; on poflar trees, Deer Park, Lower Arrow Lake, Columbia River, B.C.; on bark of oak trees at Victoria, Vancouver Island. (Macoun) On poflar trunks at Edmonton, Ont. (James White.)

258. P. dactylina, (Ach.) Nyl.

On earth running over mosses in alpine and northern districts.

Labrador or Newfoundland. (Waghorne fide Eckfeldt) On mountain summits at Hector, Rocky Mountains. (Macoun) On Unalaska and St. Paul islands, Behring Sea. (J. M. Macoun.) Islands of Behring Strait. (Wright)

259. P. ambigens, (Nyl.) Tuckerm.

On trees at Comox, Vancouver Island, May 2nd, 1887. (Macoun.) On bark of Douglas fir, Pearce Island, Gulf of Georgia, B.C. (Dr. G. M. Dawson)

260. P. rhodocarpa, Koerb.

Labrador or Newfoundland. (Waghorne fide Eckfeldt.) On bark, Arctic America. (Nylander.) On trees, northern British Columbia, June, 1875. (Macoun)

261. P. communis, DC.

On trunks and rocks.

Labrador or Newfoundland. (Waghorne fide Eckfeldt.) On trunks at Baddeck and Margaree, Cape Breton Island, N.S.; on trees, Madeline River, Gaspé Co., Que.; on trees and rocks in woods at Ottawa, Ont.; and on trunks, Aylmer, Que.; on beech trunks at Belleville, Hastings Co., Ont.; on trunks, Jordan station, Lincoln Co., Ont., May 17th, 1901; on trees, Canfield Junction, Haldimand Co., Ont.; on maple bark, Algonquin Park, Ont., July, 1900; on trees, falls of Nipigon River, Ont. (Macoun) On bark, Rigaud Mountain, Vaudreuil Co., Que. (Rev. G.Ducharme.)

262. p. leioplaca, (Ach.) Schaer.

On trees and rocks.

On bark of trees at River Head, Sparrible Cove, and Middle Arm, Newfoundland. (Waghorne.) Canada. (Richardson.) On trees, Ste. Anne des Monts River, Gaspé Co., Que.; on trees at Amqui station, Intercolonial Railway, Que.; on trunks in woods, at Baddeck and Margaree, Cape Breton Island, N.S., July, 1898; on beech trees in woods at Buckingham, Que., 1896. (Macoun.)

The above includes P. Iaevigata, Nyl., which has not been separated by us.

263. P. pustulata, (Ach.) Nyl.

On bark of trees and dead wood.

Coast of Gaspe, Que.; on old cedar rails north of Aylmer, Que., May, 1897; on bark of trees at Belleville, Hastings Co., Ont.; on alder trees at Revelstoke, B.C. (Macoun)

264. p. glomerata, (ach.) Schaer.

On earth, running over mosses in alpine and northern districts.

On earth in Baffin Land, Hudson Strait, Aug., 1897. (Dr. R. Bell.) On earth near Forteau, Labrador. (Waghorne.) Running over mosses on islands in Lake Nipigon, July 12th, 1884. (Macoun.) Islands of Behring Strait. (Wright.) Port Mulgrave, Alaska. (Rothrock.)

265. p. globularis, Ach.

On rocks amongst mosses.

Labrador or Newfoundland. (Waghorne fide Eekfeldt.)

266. p. Wulfenii, DC.

On trunks, Que. (A. T. Dnimmond.) On beech trees at Ottawa, Ont., April 21st, 1891; also at Billings Bridge, Ont, and Hull, Que. These specimens are placed here on authority but in the ofinion of the writer are doubtful. (Maeoun.)

267. p. (Variolaria) Waghornei, Hulting.

On bark of trees in company with Pertusaria Iaevigata at Whit-more, Newfoundland. (Waghorne.)

268. p. (Variolaria) lactea, Wulf.

On stones at Shoal Point, Newfoundland. (Waghorne.) The last two species are very likely included in the sorediferous forms of Pertusaria multipuncta and communis.