474. B. pulchella, (Schrad.) Tuckerm.

Moist, shaded, alpine, and arctic rocks. Arctic America. (Richardson.)

475. B. - --------------, N. Sp.

This species remains unnamed by Mr. Branth, who put it in the first section of the genus - Catolechia. On earth along Old Wives' Creek, Assa., May 23rd, 1895. (Macoun.)

476. B. albo-atra, (Hoffm.) Th. Fr.

On trunks, in Canada. (A. T. Drummond.) Labrador or Newfoundland. (Waghorne fide Eckfeldt.) Unalaska Island. (Roth rock.)

Var. saxicola, Fr.

On boulders,"elbow" of South Saskatchewan River, Assa., July 13th, 1879. (Macoun.)

477. B. spuria, (Schaer.) Arn.

Labrador or Newfoundland. (Waghorne fide Eckfeldt.) On limestone rocks in woods at Hull, Que., April 24th, 1897. (Macoun)

478. B. lepidastra, Tuckerm.

On limestone rocks west of Hull, Que., April 24th, 1897; on boulders near the "elbow" of the South Saskatchewan River, Assa., Aug., 1879. (Macoun.) Labrador or Newfoundland. (Waghorne fide Eckfeldt)

479. B parasema, (Ach.) Th. Fr.

Bark of trees and on dead wood; common.

Greenland. (Arct. Man.) Arctic America. (Richardson) On dead wood, Chimney Cove, Newfoundland. (Waghorne.) On bark, Rigaud Mountain, Vaudreuil Co., Que. (Rev. G. Ducharme.) On bark of various trees and dead wood in many places, Cape Breton Island, N. S., July, 1898; on bark of trees at Halifax, N. S.; at Salt Lake, Anticosti, Que.; on bark and dead wood, Gasp Co., Que.; on old rails at Port Daniels, Bay of Chaleurs, Que.; abundant on fence-rails and young pines around Ottawa, Ont.; on dead wood and old rails at Belleville, Hastings Co., Ont.; on fence-rails near Wooler, Northumberland Co., Ont.; on trees, Algonquin Park, Ont., June, 1900; on birch bark, Lake Nipigon; on bark of paper birch, Red Deer River, Porcupine Mountains, Man; on dead wood, Jumping Pound Creek, Rocky Mountains; on old logs near C. P. R. station at Banff, Rocky Mountains. (Macoun.) Port Clarence, Alaska. (Rothrock)

Var. triphragmia, Nyl.

On Alnus rubra, by the sea at Comox, and on Sea's farm near Victoria, Vancouver Island, June 20th, 1893. (Macoun)

480. B. papillata, (Sommerf.) Tuckerm.

Upon dead mosses, etc., in alpine and arctic regions.

Greenland. (Vahl.) On moss in woods at Banff; and on moss along Jumping Pound Creek, Rocky Mountains, June, 1897. (Macoun.)

Var. albo-cincta, Th. Fr. Islands of Behring Strait. (Wright)

481. B. myriocarpa, (DC.) Mudd.

On trees and shrubs; common on dead wood and stones.

Greenland. (Vahl) Labrador or Newfoundland. (Waghornefide Eckfeldt.) On old boards, Main Station, Sable Island, N.S., July, 1899; on old rails at Margaree, Cape Breton Island, N.S., July, 1898; on dead trees along the Gaspé coast, Gaspé Co., Que.; quite common on cedar and pine rails at Ottawa, Ont.; common on cedar rails at Wooler, Ont.; on dead pine at Banff, Rocky Mountains; on old boards along the wharf at Comox, Vancouver Island. (Macoun.) Port Clarence, Alaska. (Rothrock.)

482. B. Schaereri, De Not.

On old rails at Wooler, Northumberland Co., Ont., Oct. 14th, 1893. (Macoun.)

483. B. capitulata, Th. Fr., var. erubescens, Flot.

On smooth rocks, Labrador or Newfoundland. (Waghorne fide Eckfeldt.)

484. B. punctiformis, (Hoffm.) Eckfeldt.

On dead wood, Chimney Cove, and Little Harbour, Newfoundland. (Waghorne.)

485. B. disciformis, Fr.

Labrador or Newfoundland. (Waghorne fide Eckfeldt) Greenland. (Arct. Man)

486. B. atrata, (Sommerf.) Eckfeldt.

On rocks, Labrador or Newfoundland. (Waghorne fide Eckfeldt.)

487. B. coracina, (Hoffm.) Th. Fr.

On alpine and arctic rocks. Arctic America. (Dr. Kane)

488. B. oidalea, Tuckerm.

On bark of Douglas fir on Sea's farm near Victoria, and also at Comox, Vancouver Island. (Macoun)

11 1/2

489. B. Rittokensis, Hellb.

On rocks, Cape York, Arctic America. (Th. Fries.)

490. B. colludens, Nyl. (Tuckerm.)

Labrador or Newfoundland. (Waghorne fide Eckfeldt.) On rocks along the St. Lawrence below Quebec. (A. T. Drurnmond.) Chamisso Island, Arctic Ocean. (Rothrock.)

491. B. excentrica, (Nyl.) Eckfeldt.

Labrador or Newfoundland. (Waghorne fide Eckfeldt.)

492. B. badio-atra, (Schaer.) Koerb.

Rocks in alpine and arctic regions.

Greenland. (Vahl.) Labrador or Newfoundland. (Waghorne fide Eckfeldt.) On rocks, Deer Park, Columbia River, B.C., June 7th, I890. (Macoun.)

493. B. petraea, (Flot.) Tuckerm.

Common on rocks and dead wood.

Greenland. (Vahl.) Labrador or Newfoundland. (Waghorne fide Eckfeldt) On rocks along the St. Lawrence below Quebec. (A. T. Drummond.) On granite boulders in Rockcliffe Park, Ottawa, Ont.; at Belleville and Shannonville, Hastings Co., Ont; at Lake Nipigon, Ont. (Macoun.) St. Paul Island, Kadiak Is'and and Port Clarence, Alaska. (Rothrock)

Var. Montagnsei, Tuckerm.

Labrador or Newfoundland. (Waghorne fide Eckfeldt.) On granite boulders "elbow" of South Saskatchewan River, Assa., July 13th, 1879. (Macoun.) St. Paul Island and Unalaska Island, Cook's Inlet and Port Clarence, Alaska. (Rothr.ck.)

Var. grandis, Floerke.

Labrador or Newfoundland. (Waghorne fide Eckfeldt.) On granite boulders in Rockcliffe Park, Ottawa, Ont., April 22nd, 1897. (Macoun.)

494. B. empetraea, Nyl.

On rocks and stones Labrador or Newfoundland. (Waghorne)

495. B. coniofsoideum, (Hepp ) Eckfeldt. Labrador or Newfoundland. (Waghorne fide Eckfeldt.)

496. B. Oederi, (Ach.) Br. & Rostr.

Alpine and arctic rocks. Greenland. (Vahl) 497. B. geographica, Linn.) Tuckerm.

Greenland. (Arct. Man.) Arctic America. (Richardson.) Labrador or Newfoundland. (Waghorne fide Eckfeldt.) Newfoundland. (Pylaie.) On rocks, Tadousac, Que. (A. T. Drummond) On sandstone ridges, Wood Mountain, Assa., June, 1895; on rocks in the Crow's Nest Pass, Aug. 20, 1897; quite common on all the higher Rocky Mountains. (Macoun.) Aliaska Peninsula, Alaska. (Rothrock.)

Var. lecanorina, Floerke. On rocks, Island of Grand Manan, New Brunswick. (Willey.)

498. B. alpicola, (Wahl.) Anz.

On alpine and arctic rocks. Arctic America. (Th. Fries.)

499. B scabrosa. (Ach.) Koerb.

On Boeomyces in alpine and arctic regions.

Greenland. (Vahl.) Labrador or Newfoundland. (Waghorne fide Eckfeldt)

500. B. Parmeliarum, (Sommerf.) Tuckerm.

Upon the thallus of species of Parmelia and Cetraria. On CetrariaFahlunensis, Islands of Behring Strait. (Wright.) On Parmelia olivacea, Leading Tickle, Newfoundland. (Waghorne)

501. B. saxatilis, (Schaer.) Koerb.

Labrador or Newfoundland. (Waghorne fide Eckfeldt)

502. B. urceolata, Th. Fr.

Upon the thallus of various lichens. Greenland. (Vahl)

503. B. parasitula, Nyl.

Found on Pilofhorus cereolus, var. robustas, on the islands in Behring Strait. (Wright)

504. B. glaucomaria, (Nyl.) Tuckerm.

On the thallus of Lecanora glaucoma, Greenland. (Stitzenberger.

505. B. Pertusaricola, Willey.

Labrador or Newfoundland. (Waghorne fide Eckfeldt.) On the thallus of a Pertusaria, on poflar trees at Ottawa, Ont., Oct. 16th, 1889. (Macoun)

506. B. obscurata, (Ach.) Eckfeldt.

On rocks, Labrador or Newfoundland. (Waghorne fide Eckfeldt.) Quite common on limestone and other rocks around Ottawa, Ont., and at Aylmer, Que., 1900. (Macoun.)

501. B. rivularis, (Flot.) Eckfeldt.

On rocks, Labrador or Newfoundland. (Waghorne fide Eckfeldt.)

508. B. Cofelandi, (Koerb.) Eckfeldt.

On rocks, Labrador or Newfoundland. (Waghorne fide Eckfeldt.)

509. B. concreta, (Koerb.) Eckfeldt.

On rocks, Labrador or Newfoundland. (Waghorne fide Eckfeldt.

510. B. calcarea, (Weis.) Eckfeldt.

On rocks, Labrador or Newfoundland. (Waghorne fide Eckfeldt.)

511 B. rubescens, (Arn.) Eckfeldt.

On smooth bark, Labrador or Newfoundland. (Waghorne fide Eckfeldt.)

512. B. verruculosa, Bon.

On stones, Chimney Cove, Newfoundland. (Waghorne.)

513. B. reductum, Th. Fr.

On stones, Birchy Cove and Summerside, Newfoundland. (Waghorne.)

514. B. (Rhizocarpon) empetrseum, Nyl.

On rocks, Labrador, 1896; on rocks, Lark Harbour, Newfoundland. (Waghorne.)