(637.) L. polycarpa, Ehrh.; Lesq. & James, Mosses of N. America, 301; Canadian Musci, No. 251.

Hypnum medium, Drumm. Musc. Bor. - Am., No. 223.

About the roots of trees in swamps. (Drummond.) On trunks of trees subject to inundation; Bass River, Newcastle, Grand Lake and Fredericton, N.B. (Fowler's Cat.) Roots of trees, Tobique River, and Lac Bean, St. Francis, N.B. (Hay.) Tay, York Co., N.B. (J. Moser.) Very abundant on the inundated flats at the mouth of the Gatineau near Ottawa; on the bases of trees on the river flats two miles above the railway bridge at Trenton, Ont.; on trees at Sudbury Junction, Ont.; abundant on trees, Foster's Flats, below Niagara Falls; on trees, Dawson Route west of Lake Superior; on trees subject to inundation at Sicamous and Kamloops, B.C. (Macoun.)

(638.) L. cyrtophylla, Kindb. (n. sp.)

Tufts dense, dark green or brown, not shining. Stems irregularly branching, filiform, with few rhizoids. Leaves nearly uniform, very small, appressed when dry, open-erect when moist, concave, from a broad rotundate-ovate base short-acuminate, entire, faintly papillose, borders reflexed below; cells rotundate, sub-hyaline; costa indistinct or none. Dioecious. Capsules not found.

The allied Leskea (Pseudoleskea) catenulata and Leskea (Heterocla-dium) papillosa, Lindb., both differ in the costate leaves.

On rocks on islands in Lake Nepigon, July 10th,. 1884. (Macoun.)

(639.) L. subobtusifolia, C. M. & Kindb. (n. sp.); Canadian Musci, No. 533.

Plants loosely tufted, yellowish green or fuscescent. Stem sparingly radiculose, irregularly divided, beset with paraphyllia; branches curved at apex. Leaves distant, decurrent, entire, distinctly papillose at back, loosely appressed when dry, very patent when moist, margins recurved at the base; stem-leaves broadly ovate, obtuse or subacute, branch-leaves oblong, obtuse; cells round, the alar quadrate; costa sub-percurrent. Capsule oblong, inclined, subcurvate; lid short, mammillate; calyptra narrow, cucullate: pedicel about 1 cm. long. Perichetial leaves large, short, ovate-lanceolate, short-acuminate, costate. Monoecious. This species resembles Leskea obscura.

On trees subject to inundation at the mouth of Pass Creek, near Sproat, Columbia River, B.C. June 19th, 1890; also on trees at Nelson, Kootanie River, B.C. 1890. (Macoun.)

(640.) L. nervosa, Myrin; Lesq. & James, Mosses of N. America, 302; Canadian Musci, No. 252, in part.

Battle Harbor, Labrador. (Rev. A. Waghorne.) On trees at Frederic-ton, N.B. (Fowler's Cat.) On rocks at the mouth of Michaud River, Rimouski Co., Que. (J. A. Allen.) Tay, York Co., N.B. (J. Moser.) On trees, Grand Etang, Gaspé Co., Que.; also on Mount Albert, Gaspé, Que.; on trees at Ottawa. Belleville and Owen Sound, Ont.; and on trees on Gaulois Point, Lake Superior; on trees, Swan Lake House and Point Wilkins, Lake Winnipegoosis, Man.; on rocks, "Dry Canon," discharge of Devil's Lake, Rocky Mountains; on trees at Pass Creek near Sproat, B.C.; also on rocks at Yale, B.C. (Macoun.) On trees, Buffalo Lake, N.W.T. (J. M. Macoun.)

(641.) L. denticulata, Sulliv.; Lesq. & James, Mosses of N. America, 302.

On trees at Canaan Forks, Queen's Co., N.B. (J. Moser.)

(642.) L. pulvinata, Wahl.; Lesq. & James, Mosses of N. America, 303; Canadian Musci, No. 253.

On trees along Peace River, at Hudson Hope, lat. 56°; also on trees by ponds at McLeod's Lake, B.C., lat. 55°. (Macoun.)

(643.) L. Wollei, Aust.; Lesq. & James, Mosses of N. America, 304.

Niagara Falls. (Wolle.) On rocks east shore of Lake Superior. (Macoun.) This species belongs rather to the genus Amblystegium.