Naturalization of an Exotic Fern.—Records of ferns becoming naturalized in new regions are very rare. _Pteris serrulata_ is probably our most conspicuous American example, having been found as an escape in several places, while it is known to grow abundantly on old walls in New Orleans. I have also reported the occurrence in the same place, of an abundance of _Pteris longifolia_ previously known in the United States from Florida alone. In the Fern Bulletin for January, 1898, mention is made of fronds of _Pteris tremula_ seventeen inches high collected from the walls of a tunnel in New York City, and the same article mentions a Japanese species of _Athyrium_ that has become naturalized on Staten Island, New York. To this meagre list, it is with much pleasure that I add another species in the shape of the Japanese climbing fern (_Lygodium Japonicum_). This Mrs. A. P. Taylor has sent to me from Thomasville, Georgia, where she finds it in profusion along the sides of a deep ditch. The station is not far from a greenhouse from whence the plants doubtless came in the first place, but all indications point to a further spread of this pretty and interesting species. The Forms of the Spinulose Wood Fern.—It is well-known to fern students that much more attention has been paid to the forms of ferns on the other side of the Atlantic than on this. Since the same species are often common to both localities, it is but natural that the early students of American ferns should pay rather more attention to the mere forms of species common to Great Britain and America than their systematic importance warrants. This is especially true of the variable _Nephrodium spinulosum_ whose variety _intermedium_, I am convinced, is scarcely more than an ecological form. In this view I am glad to be borne out by Mr. A. B. Klugh, who has recently examined nearly 500 Canadian specimens and come to the same conclusion. Mr. Klugh writes: “In number of glands on the indusium, in color of scales on the stipe, in shape and cutting of the frond and in degree of obliquity of the pinnae, we have a perfect gradation from true _spinulosum_ to typical _intermedium_. Our commonest form has the indusium glandular and the scales of the stipe pale brown without a dark centre.” In a series of fronds examined there seemed to be no corelation between the color of the scales and the glands on the indusium, there being fronds with light scales and no glands, others with dark centered scales and many glands, and still others the exact opposites of these. _Intermedium_ may be distinguished as a form, but it is certainly far less distinct than such plants as _Nephrodium cristatum Clintonianum_ or _Pteris aquilina pseudocaudata_ and would probably never have appeared in our lists but for the fact that much has been made of the forms of this species in other lands.