Amongst mosses on rocks and on tree trunks in alpine and arctic regions.

Greenland. (Retz) Arctic America. (Richardson) On rocks, Clearwater Lake, Northern Labrador, 1896. (A. P. Low.) On rocks, Nain, Labrador. (Dr. R. Bell.) Labrador. (Waghorne) Barren Grounds, Lat. 61° 13', Long. 104o, W. (J. W. Tyrrell.) On rocks, Tadousac, Que. (A. T. Drummond.) Quite common on earth or rocks in woods, Smoky Mountain and Half-Way Brook, Cape Breton Island, N.S., Aug., 1898; on rocks, Becscie River, Anticosti; summit of Mount Albert, Gaspé Co., Que.; on rocks, Lake Agnes, and on earth in woods at Hector, Rocky Mountains; on rocks in Roger's Pass, Selkirk Mountains, B.C. (Macoun.) Northwest coast. (Scouler.) Cape Vancouver and Unimak Island, Behring Sea. (J. M. Macoun.)

117. N. expallidum, Nyl.

On earth, dead wood, etc., in the arctic regions. Labrador. (Waghorne.) Great Bear Lake. (Richardson.)

118. N. tomentosum, (Hoffm.) Koerb.

Tree trunks in mountain forests, and also on rocks. On wood, Tobique River, N.B. (67. U. Hay.) On rocks at Shannonville, Hastings Co Ont.; on trees North Bay, Lake

Nipissing, Ont.; on both rocks and trunks of trees, Lake Nipigon, Ont., on perpendicular rocks, northeast shore Lake Superior; on trees, Manitoba House, Lake Manitoba, Man.; on trees and rocks at Revelstoke, B.C.; on rocks at Quesnel, Fraser River, B.C.; on trees at Hastings, Burrard Inlet, B.C.; common on trees around Victoria, Vancouver Island. (Macoun) On rocks, Athabasca River, Atha. (J. M. Macoun)

H9. N. Helveticum, Ach.

On trees and rocks.

Arctic America. (Richardson.) On rocks, Ste. Anne des Monts River, Gasp Co., Que.; on rocks, vicinity of Ottawa, Ont.; and on trees and rocks, Lake Nipigon; on rocks, Otter Slide Creek, Algonquin Park, Ont., July, 1900; on old logs, Hector, Rocky Mountains; on earth and rocks at Revelstoke, B.C.; and at Deer Park, Lower Arrow Lake, Columbia River, B.C. (Macoun.)

120. N. Iaevigatum, Ach.

On mossy rocks and on tree trunks.

East Ste. Modeste, Labrador; on rocks, Leading Tickle, Newfoundland. (Waghorne.) On Rigaud Mountain, Vaudreuil Co., Que. (Rev. G. Ducharme.) On earth and sand, east end of Sable Island, N.S., Aug. 8, 1899; on rocks in a ravine, Big Intervale, and at McNeill's Harbour, and on trunks at Baddeck, Cape Breton Island, N.S., 1898; on trees, Jupiter River, Anticosti; on rocks, Cape Rosier, Gaspé Co., Que.; not uncommon on boulders around Ottawa, Ont.; on rocks, King's Mountain, near Chelsea, Que.; on boulders in woods at Belleville and Brighton, Ont.; on rocks and trunks, Algonquin Park, Ont., July, 1900; on rocks, Roger's Pass, Selkirk Mountains, B.C.; on rocks and earth, Bragg's Creek, and Moose Mountain, Rocky Mountains, alt. 6,000 feet; on rocks at Victoria and on Mount Benson, Vancouver Island. (Macoun.)

Var. parile, Nyl.

Forteau, Labrador. (Waghorne.) On rocks at Canaan Forks, Queen's Co., N.B. (J. Moser.) On rocks, Big Intervale, Mar-garee and McNeill's Harbour, Cape Breton Island, N.S., Aug. 4,

1898; on boulders along Jupiter River, Anticosti; on boulders at King's Mountain, near Chelsea, Que.; on rocks, Catfish Lake, Algonquin Park, Ont., July, 1900; on rocks at Thunder Bay, Lake Superior and along Lake Nipigon; on rocks at Deer Park and Pass Creek, Columbia River; on rocks at Sicamous, B.C.; on rocks, Moose Mountain, alt. 6,000 feet, Rocky Mountains. (Macoun.)

121. N. Lusitanicum, Sciaer.

On rocks, trees and bushes.

On rocks, Notre Dame Bay, Newfoundland. (Waghorne.) On rotten wood at Revelstoke, Columbia River, B.C.; on rocks by the sea, Victoria Arm and Cadboro Bay, Victo ia, and in same situation at Qualicum and Comox, Vancouver Island. (Macowi)