This is a common species on Quercus Garryana in the neighbourhood of Victoria, Vancouver Island. Many of the specimens are much elongated and hang in festoons from the trees. (Macoun.) On trees, Henslow Island, Gulf of Georgia, B.C. (Dr. G. M. Daw-son.)

This is a very remarkable species and as far as known does not extend north of Henslow Island, Gulf of Georgia. The reticulations are much larger in southern specimens.

2. R. calicaris, (Linn.) Fr. var. fraxinea, Fr.

Not uncommon on fence-rails, trees, etc. Distinguished by its wide and long-lobed thallus. Apothecia lateral.

Rather rare in woods at Big Intervale, Cape Breton Island, N.S., 1898; on balsam fir, Stittsville, near Ottawa, Ont, May, 1897; fence-rails at Belleville and Brighton, Ont.; on trees, Lake Nipigon, Ont.; on oak trees at Comox, Vancouver Island. (Macoun.) Rigaud Mountain, Vaudreuil Co., Que. (Rev. G. Du-charme.) On spruce trees and a board fence, Edmonton, Ont. (James White.)

Var. fastigiata, (Pers.) Fr.

Branches compressed and inflated, without soredia. Lobes of thallus crowded. Apothecia terminal or subterminal.

Not uncommon on old fences, old logs and trunks in woods at Ottawa, Belleville and Brighton, Ont.; on trunks, Algonquin Park, Ont., 1900; on oak trees at Comox, Vancouver Island. (Macoun.) On spruce trunks at Edmonton, Ont. (J. White.)

Var. canaliculata, Fr.

Lobes narrow and channelled. Apothecia attached just below the deflexed tips.

On trees throughout the eastern provinces; but rare.

On trees, New Brunswick. (Prof. Fowler.) At Truro, Nova Scotia; Gaspe Peninsula, Quebec; in the vicinity of Ottawa, Ont.; Algonquin Park, Ont., June, 1900; along the Nipigon River, Ont.; near Kananaskis Falls, Rocky Mountains. (Macoun.)

Var. farinacea, Schaer.

Thallus either flattened or rounded, generally much branched and finally attenuate; besprinkled with white powdery soredia; apothecia rare. Apparently the commonest form of the species. Common on both trees and rocks.

L'Anse au Clair, Labrador. (Waghorne.) On trees, Salt Lake, Anticosti; on rocks and trees, Riviere Ste. Anne des Monts, Gaspé, Que.; on trees, Brackley Point, Prince Edward Island; on old fences, Sable Island, N.S., July 27th, 1899; on trees and rocks, Big Intervale, on rocks at Louisburg, and on trees at Grand Narrows and Baddeck, Cape Breton Island, N.S.; on rocks and trees near Ottawa, Ont.; on rocks, Algonquin Park, Ont., June, 1900; on trees at Belleville, Ont.; on rocks, Thunder Bay, Lake Superior; on rocks Lake Athabasca; on trees, Hastings, Burrard Inlet, B.C.; Victoria and Comox, Vancouver Island. (Macoun.) Rigaud Mountain, Vaudreuil Co., Que. (Rev. G. Ducharme.) On trees, Alert Bay and Thurlow Island, Vancouver Island. (Dr. G. M. Dawson) On trees near Cape Beale, Vancouver Island. (J. M. Macoun)

3. R. minuscula, Nyl.

R. pusilla, (Prev.) var. geniculata, Tuckerm. On trees and branches; not rare.

Canada. (A. T. Drummond.) Arctic America. (Hooker.) Abundant on trees at the Big Intervale, Margaree River, Cape Breton Island, N. S.; near Ironsides on the road to Chelsea, Que.; on small trees, and branches, Lake Nipigon, Ont.; on small trees, Hastings, Burrard Inlet, B.C.; on willows, Burnside Road, Victoria, Vancouver Island. (Macoun.)

4. R. dilacerta, Hoffm.

R. minuscula, f. pollinariella, Nyl.

Eagle River, L'Anse au Mort, and Blanc Sablon, Labrador; on branches of trees, Middle Arm, Newfoundland. (Waghorne.)

5. R. pollinaria, (Westr.) Ach.

Bay of Exploits, Newfoundland. (Waghorne.) Unalaska Island, Behring Sea. (J. M. Macoun.)

6. R. polymorpha, Ach.

Quite common on trees in the Maritime Provinces.

On rocks, Newfoundland. (Despreaux.) On dead balsam fir at Baddeck, Big Intervale and Louisburg, Cape Breton Island, N. S.; Jupiter River, Anticosti; Brackley Point, Prince Edward Island; Little Chlorodorme, Gaspé Co. Que.; on old fence posts and boards Sable Island, N. S., July 27, 1899. (Macoun.) On islands in Behring Strait. (Wright) On rocks St. Paul Island, Behring Sea. (J. M. Macoun.)

1. R. cuspidata, Ach.

A specimen referred here was collected on St. Paul Island, Behring Sea, Aug 18th, 1892, by Mr. J. M. Macoun. The plant is perfectly smooth, polished and shining. There is no sign of soredia and the apothecia is lateral. (No. 615.) On June 19, 1897, other specimens were collected on St. Paul Island by Mr. Macoun and referred here by Prof. Branth.