670. P. atrovirens, (Dicks.) Br. Eur.

P. patens, Limpr.; Ren. & Card., Bot. Gaz. Vol. XXX., p. 22. P. atroviaens, subsp. tenella, Kindb., Bryol. N. Am. & Eur., 50.

Labrador and Newfoundland. (Waghorne.) On rocks, Dawson route, west of Lake Superior, July 25th, 1872, referred in Part VI. to Leska polycara; on rocks, Mount Benson, near Nanaimo, Vancouver Island, 1887 and 1893. Referred to P. oligoclada in Part VI. On rocks at Sicamous, B.C., July 3rd, 1889, referred to P. falcicuspis in Part VI. On rocks, Crow's Nest Lake, Rocky Mountains, Aug. 3rd, 1897. (Macoun.)

680. P. oligoclada, Kindb.

On damp rocks, Mount Benson, near Nanaimo, Vancouver Island, June 8th, 1887 and July 10th, 1893; on rocks at the Illicil-lewaet Canon, near Revelstoke, B.C., May 18th, 1890. (Macoun.)

681. P. denudata, Kindb.; Best, Torr. Bull., Vol, XXIX., p. 229. Type locality as in Part VI.

Var. Holzingeri, Best. New. var.

Cape Chudleigh, Hudson Strait, Aug. 8th, 1884. (Dr. R. Bell.)

684. p. rigescens, (Wils.) Lindb.

P.stenophylla, Ren. & Card.; Cat. Can. Pl. Part, VI., 181.

Quite common on stems of alder and on stones on damp mountain slopes in Roger's Pass, Selkirk Mountains, B.C., Aug. 5th and July 31st 1890; on rocks, mountains north of Griffin Lake in the Gold Range, B.C., Aug. 9th, 1889. (Macoun.)

683. P. radicosa, (Mitt.) Lesq. & James.

Labrador and White Bay, Newfoundland. (Waghorne.) On rocks, Roger's Pass, Selkirk Mountains, B.C., July 29th and Aug. 2nd, 1890; on rocks, mountains, north of Griffin Lake, B.C., Aug. nth, 1889; on rocks, Yale, B C, May 18th, 1875; on rocks at Quesnel, B.C., May 29th, 1875; on rocks, Moose Mountain, Elbow River, Alta., July 4th, 1897. (Macoun.) Lake Lindeman, Yukon. (Williams.)

Var. compacta, Best. Bull. Torr. Bot. Club, Vol. XXVII., 231.

In intricate tufts or loose mats, dark green to blackish, branches often with yellow-green tips; stems 2-3 cm. long; branches short, turgid; stem-leaves not rarely straight; median leaf-cells oval-rhombic to oblong-hexagonal.

On rocks in a brook in Roger's Pass, August 21st, 1885 and July 31st, 1890; also on rock three miles below Hector, Rocky Mountains, B.C., August 13th, 1890. (Macoun.)

1128. P. substriata, Best.; Bull. Torr. Bot. Club., Vol XXVII.,

P. 233.

In appressed.subshining tufts, yellowish green to golden-brown; stems prostrate, radiculose 2-4 cm. long, pinnately branched; branches suberect, simple, scarcely curved; paraphyllia few, multiform; stem leaves erect-spreading, straight, deeply biplicate,oval-oblong, gradually acute or acuminate (acumen shorter than body), .8-1 mm. long, 3-4 mm. wide; margins strongly recurved to nearly apex, serrate above; costa toothed, subpercurrent; stem-leaves smooth, clear; basal, oblong-linear in 2 or 3 rows; alar quadrate, rugose, thick-walled, filling the space between folds and margins, extending upwards and becoming oblong; apical linear; median sublinear .006 mm. wide, 4-6 times as long.

Type specimens collected on rocks three miles below Hector, on the Canadian Pacific Railway, B.C., Aug. 13th, 1890. It was originally numbered 484 and named /. atrovirens by Dr. Kind-berg.

On rock along the shore of Lake Lindrman, Yukon. (Williams.)

We have followed Dr. Best in the arrangement of our specimens of this genus as we believe he has done good and careful work.

1129. P. pallida, Best. var. filescens, Best. Head of Lake Bennett, Yukon. (Williams.)