20. C. quadrata, (Scop.) Trevis.

Preissia commutata, Nees.; Pearson's List No. 164.

Quite common on wet earth at Truro, N.S.; on wet limestone rocks, along the Gaspé coast, Que.; along Gunn River, Anticosti; on wet earth, Grand Narrows, Cape Breton Island, July, 1898; rocky banks near Belleville and along a small brook, Huntingdon, Hastings Co., Ont.; crevices of rocks, Foster's Flats, Niagara Falls, May 16th, 1901; wet ground along LakeNipigon; on earth in many places along Lake Superior; on earth at the "Cave Mounds," Banff, Rocky Mountains; Hector and Lake Agnes, Rocky Mountains; in Crow's Nest Pass, Rocky Mountains, Alta.; on earth at Albert Canon,Selkirk Mountains,B.C.; under wet rocks, Eagle Pass, Gold Range, B.C,; on rocks at Revelstoke, Columbia River, B.C.; on wet earth Kootenay Lake, B.C. (Macoun.) Cape Vancouver, Alaska. (J. M. Macoun.) Chilcat, Alaska. (Krause.) Juneau, Wrangell, Muir Glacier, Point Gustavus, mountains near Juneau, Alaska. (Miss G. Cooley.) Hooniah Village, Port Wells, and Coal Creek Hill, Alaska. (Evans.) Scoresby Sound, Lat. 70° 15', and Hold-with-Hofe, Lat. 730 30', East Greenland. (C. Jansen.)