536. M. pycnocarpum, Nyl.
On bark of oak trees at Aylmer, Que.; abundant on young trees of Acer rufrrum in a. swamp above the Central Ontario Junction, Hastings Co., Ont. (Macoun.)
537. S. ceratites, Nyl.
Clearwater Lake, northern Labrador, July 21st, 1896. (A. P. Low.) This occurs on islands in Behring Strait. (Wright.) On Attu Island, Behring Sea, Aug. 29th, 1901. (J. M. Macoun)
541. A. tigillare, De Not.
Labrador or Newfoundland. (Waghorne fide Eckfeldt.) Arctic America. (Richardson.)
542. A. tympanellum, (Ach.) De Not.
On the old wharf at Hastings, Burrard Inlet, B.C., April 16th, 1889; and on old wharf at Comox, Vancouver Island, June, 1893. (Macoun.)
556. C - furfuracea, (Linn.) Ach.
On stems of plants, Birchy Cove, and Middle Arm, and on stones, Ballantyne Cove, Newfoundland. (Waghorne.) On the roots of trees, chiefly pine, in the shade at Dow's swamp, near Ottawa, Ont, and on pine roots at Ironsides, Que.; on old stumps in Algonquin Park, Ont., June, 1900. (Macoun.)
562. S. Drummondii, Tuckerm.
On Trenton limestone, at Kingston, Ont. (A. T. Drummond.)
563. S. umbrina, (Wahl.) Tuckerm.
Greenland. (Arct. Man) On limestone rocks, Kingston, Ont. (A. T. Drummond)
564. S. majusculum, Nyl.
Labrador or Newfoundland. (Waghorne fide Eckfeidt)
565. T. virens, Tuckerm.
Labrador or Newfoundland. (Waghorne fide Eckfeldt.) On trees in Canada. (A. T. Drummond.) At Big Intervale, Margaree,
Cape Breton Island, N. S., 1898; on beech trees at Beechwood and Casselman, near Ottawa, Ont.; near Wooler and at Belleville, Ont. (Macoun) On bark, Rigaud Mountain, Vaudreuil Co., Que. (Rev. G. Ducharme.)
566. S. Cestrensis, Tuckerm.
On bark of maples, Margaree, Cape Breton Island, N.S., July, 1898; on young maples at Ottawa, Ont., May, 1892; on King's Mountain, Chelsea, Que., May, 1897. (Macoun.)
56V. S. oxyspora, (Nyl.) Tuckerm.
Labrador or Newfoundland. (Waghorne fide Eckfeldt.)
568. s. carpinea, Pers.
On bark, St. John's Beach, Newfoundland. (Waghorne.)