246. R. nimbosa, (Fr.) Th. Fr.

Naked earth in alpine or northern districts. Greenland. (Vahl.)

247. R. oreina, (Ach.) Mass.

Greenland. (Arct. Man.) On rocks at the "elbow" of the South Saskatchewan, Assa., July 13th, 1879; also on Laurentan rocks at Shannonville, Hastings Co., Ont.; abundant on boulders on the prairie throughout Assiniboia, June, 1895. (Macoun)

248. R. Ascociscana, Tuckerm.

On trunks, Quebec. (A. T. Drummond) On beech trees at Belleville, Hastings Co., Ont., April 20th, 1879; on beech trees at Ottawa, Ont., April 29th, 1891; also in woods at Billings

Bridge, near Ottawa, April, 1897. (Macoun.)

249. R. turfacea, (Wahl.) Nyl.

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

Greenland. (Vahl.) Labrador or Newfoundland. (Waghorne fide Eckfeldt.) On earth, north shore of Lake Superior; on earth in woods at Banff, on Moose Mountain and at Morley, Rocky Mountains; in Roger's Pass, Selkirk Mountains, B.C. (Macoun.) Islands of Behring Strait. (Wright)

Var. mniaraea, Nyl.

Greenland. (Arct. Man.) Along Bragg's, Creek foothills of Rocky Mountains; on earth at Hector in the Rocky Mountains; northern British Columbia. (Macoun.) On islands in Behring Strait. (Wright)

250. R. succedens, Nyl.

Wild Cove, M'lver's Cove, Frenchman Cove, Middle Arm and Chimney Cove, Newfoundland. (Waghorne)

251. R. teichofhila, Nyl.

On rocks, Chimney Cove, Little Harbour, Newfoundland, (Waghorne.)

252. R. sofhodes, (Ach.) Nyl.

Common on bark.

Greenland. (Arct. Man) On bark of trees, John's Beach, Deer Lake, and on rocks, Chimney Cove, Newfoundland. (Waghorne)

Quite common on bark of young red maples in the vicinity of Ottawa, Ont.; on maple trees at Belleville, Hastings Co., Ont; on bark, Parson's Mountain, near Victoria, Vancouver Island. (Doubtful.) (Macoun)

Var. atrocinerea, Nyl.

On rocks at Shannonville, Hastings Co., Ont., Oct., 1882. (Macoun.)

Var. confragosa, Nyl.

On maple trees at Belleville, Hastings Co., Ont.; on young poflars, Sea's farm, near Victoria, Vancouver Island, May 22nd, 1893. (Macoun.)

Var. exigua, Fr.

Greenland. (Arct. Man.) On limestone rocks in Rockcliffe Park, and at the Hogsback, 4 miles from Ottawa, Ont., April, 1897; on old fence-rails at Brighton, Northumberland Co., Ont.; on bark, North Bay, Lake Nipissing; on poflar bark, Lake Nipigon, Ont.; on green ash bark at Old Wives' Creek, Assa., June, 1895; on poflar bark, Jumping Pound Creek, Rocky Mountains, June, 1897; on bushes in woods at Comox, Vancouver Island, June 23rd, 1893. (Macoun.)

253. R. constans, (Nyl.) Tuckerm.

On living and dead wood.

On bark of living beech at Ottawa, Ont.; on old logs at Hastings, Burrard Inlet, B.C. (Macoun.)