. The Canadian field-naturalist. . Figure 5. Dryopteris spinidosa Watt, Britton 1714, Montana, Glacier National Park, June 27, 1969. Figure 6. Dryopteris intermedia Gray, Britton 582, Ontario, Grey Co., Skinner's Bluff, June 15, 1962. 18527 (GH) (Standley 1921), this species was not seen. No collections were made of Dryopteris in- termedia in Idaho and Montana. Circumstan- tial evidence of its absence at John's Lake and Lake McDonald was indicated in that no Dry- opteris intermedia X spinidosa (Dryopteris X triploidea Wherry) were present in, or near the large colonies of Dryopteris spinulosa.
. The Canadian field-naturalist. . Figure 5. Dryopteris spinidosa Watt, Britton 1714, Montana, Glacier National Park, June 27, 1969. Figure 6. Dryopteris intermedia Gray, Britton 582, Ontario, Grey Co., Skinner's Bluff, June 15, 1962. 18527 (GH) (Standley 1921), this species was not seen. No collections were made of Dryopteris in- termedia in Idaho and Montana. Circumstan- tial evidence of its absence at John's Lake and Lake McDonald was indicated in that no Dry- opteris intermedia X spinidosa (Dryopteris X triploidea Wherry) were present in, or near the large colonies of Dryopteris spinulosa. This would be an unlikely absence in eastern North America. Accordingly, the most easterly members of the western diploid taxon which we have are those reported from Rocky Mountain National Park, Colorado; Lake McDonald, Glacier Na- tional Park; and Waterton Lakes, Alberta. In western Alberta, this taxon is only occasionally found east of, or immediately on the Contin- ental Divide, Waterton Lakes, Mount Edith Cavell, Lake Louise, Alberta, in areas where it is cool and moist. Northward, the distribution of the species is now fairly clear. Cody and Porsild (1968) cite a number of specimens from the Yukon and one in Mackenzie close to the Yukon border, which is the most easterly record in the area (Flat River 61° 58'N., 128° 15'W.). A plant from this last locality in west- ern Mackenzie was studied cytologically by Mulligan & Cody (1968), and was found to be diploid. Scamman (1949) says the most northerly record in the Yukon Valley is from Circle Hot Springs and Hulten (1941) says it is apparently absent in the upper Yukon Valley. The distribution of the western diploid is north- ern California, Oregon, Colorado, Washington, Idaho, Montana, Alberta, British Columbia, the southern Yukon, western Mackenzie and Alaska. A good, recent distribution map for the species is given by Taylor (1970). Although I agree with the concept of Hulten (1958) of the broad range he has sh
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