Elevation and Lycopodium selago.—Some time ago I noted in this series, that a party of botanists on a visit to Mt. Ktaadn had found _Lycopodium selago_ grading into _L. lucidulum_ as they traveled downward from the summit, and quoted their opinion that _L. selago_ is a xerophytic form of _L. lucidulum_. In regard to this, Mr. J. B. Flett writes that if the one intergrades with the other, it is doubtless due to elevation or cold, and not to xerophytic conditions. As to the plant’s habitat in the northwest, he says: “I have never seen _L. selago_ growing in a really dry place, I have studied this form in the field from Washington through British Columbia into the islands of southwestern Alaska and on the Aleutian Islands, also on the tundra between Cape Nome and Cape York. No one familiar with this tundra region would ever assert that there are any xerotic forms on it.” SCOLOPENDRIUM FROM CANADA. By Homer D. House. At least four stations for the Harts-tongue fern are known in the vicinity of Owen Sound in northwestern Ontario. Specimens from these localities are rare in herbaria, and the writer is fortunate in receiving specimens from near Collingwood, a station twenty-three miles east of Owen Sound. This station was first authentically reported by Mr. Osler and described by Mr. Maxon in “Fernwort Papers” in 1900. These specimens were collected by Dr. W. A. Bastedo and he describes the place where they were collected as being five or six miles from Collingwood. The plants were growing in a shady, though rather open wood, along the course of a small stream. The altitude is given as 1635 feet above sea-level. The plants at the time of collection, July 17th, 1903, were nearly all young and even the mature fronds are but five to eight inches in length, though all of them are very broad for their length. Dr. Bastedo further notes that in the recesses of the cliff, snow was still abundant at that date. _Polystichum Lonchitis_ and _Dryopteris Filix-mas_ were abundant and _Asplenium Trichomanes_ and _Cryptogramma Stelleri_ were common upon the cliffs. This station is undoubtably one of those described by Mr. Maxon in the neighborhood of Collingwood. However, a careful search of this entire region is very much to be desired, as it is probable that the fern has a more general distribution in this region than is known at present. THE GENUS EQUISETUM IN NORTH AMERICA. By A. A. Eaton. FIFTEENTH PAPER. Varieties of E. Hiemale.