thesis on the Ferns of Quebec,7 Brother Marie-Victorin included this fern, remarking that since it occurs in Vermont almost up to the Canadian boundary, it is surely present in Quebec also. Although this was doubted by others, the fern was later discovered near Bedford, in Quebec a few miles north of the Vermont border, as reported by Mousley.8 In lectures on the plant geography of the eastern United States, the writer likes to show distribution maps representing species which because of their general distribution may be classed as northern, western, southern, and finally eastern. It was not easy to find a good illustration of the last category, but the bog fern proved to be an excellent one. Its range is most reasonably interpreted as corresponding to its former occurrence, and presumably evolution, on the land which extended from the North Carolina cape region to Nova Scotia and Newfoundland during fairly recent geological times. By the time that land mass had sunk beneath the sea this fern had migrated far enough west to escape annihilation, but its ancestors or connecting links with related entities failed to do so.