(232.) S. aquatica, Hook.; Drumm. Musc. Bor. - Am., No. 63.

Grimmia Scouleria, Lesq. & James, Mosses of North America, 137. Scouleria aquatica, var. virescens, Kindb., Bull. Torr. Bot. Club XVI., 93 Canadian Musci, No. 105.

Upon stones in the Columbia and Portage rivers. (Drummond.) On stones in mountain brooks and in the Eraser River at Yale, B.C.; fruiting abundantly; also on rocks in a mountain brook, Lake Mara, near Sicamous, B.C. (Macoun.)

(233.) S. Nevii, C. Muell., Bull. Torr. Bot. Club XVII., 273.

S. aquatica, var. nigrescens, Kindb., Bull. Torr. Bot. Club, XVI. 94; Canadian Musci, No. 388.

Leaves when dry more or less patent, dark green, broader near the middle, very short-acuminate, suboblong-elliptic, obtusely dentate also below the middle, entire in the broad rounded apex, margined by obscure cells; upper cells dusky, the lower subpellucid, the median of the base linear and not porose. Scouleria aquatica has the leaves when dry appressed and blackish (only the uppermost green), broader at the base, narrow below the middle and acuminate, ovate-lanceolate, sharply serrate from the middle to the contracted apex, very distinctly margined by obscure cells; the most of the cells dusky and thick-walled except the few median linear not porose ones of the base; inner perichetial leaves shorter, less dusky; perigonial leaves short, suboval and very obtuse.

On rocks in Glacier Creek, Roger's Pass, Selkirk Mountains, B.C.; in a mountain brook, Lake Mara, near Sicamous, B.C.; on rocks in the Nanaimo River, below the railway bridge, near Nanaimo, Vancouver Island. (Macoun.)

(234.) S. Muelleri, Kindb. (n. sp.) Canadian Musci No. 558.

Leaves when dry loosely appressed and dark green, broader above the base, oblong-ovate or nearly ellipitic, very short-acuminate, sharply serrate above, already below, the middle; entire in the broad rounded apex, indistinctly margined by pale-orange cells; all cells subpellucid, the median at the base linear, porose and numerous. Inner perichetial leaves longer, from the short dilated and entire base sublinear and serrate, very pellucid.

On boulders in the Columbia River, about a mile and a half above Revelstoke, B.C., on the east side of the river, May 12th, 1890. (Macoun.)

In an article by Mrs. E. G. Britton in Vol. XXIV., pp. 36-43 of the Torrey Bulletin the reader will find the three species given on pages 61-62 of part VI. of my Catalogue of Canadian Plants fully discussed. In the article before me she reduces the three species to one and retains S. aquatica var. nigrescens, the original of S. Nevii, as regards my specimens. I fully agree with Mrs. Britton in her decision as I could see no reason for separating the plants when fresh except by their color.

No specimens of this species have been collected since the publication of Part VI.

232. S. aquatica, Hook.

Fine fruiting specimens collected near Canon City. Dyea Creek, Alaska. As usual, in clear mountain streams, the plants are blackish and robust; also collected sterile specimens in Miles's Canon and in fruit on the Yukon at Dawson, 1899. (Williams.) On rocks in Chilliwack River, B.C. (J. M. Macoun.)