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THE FERN FLORA OF NEW YORK.
The State of New York has the largest area of any northern State east of Michigan. It also possesses a great diversity of surface, with its two mountain ranges, its numerous lakes, its interior salt basin, and its seashore confined entirely to the southern extremity. On its eastern side it stretches through more than four degrees of north latitude, and as these are the degrees just south of the 45th parallel, it is easy to understand that there is liable to be a greater intermixture of northern and southern forms of ferns than there would be in a State lying farther south. And the fact is that certain species from the north and others from the south do meet within its borders. This also accounts for the large number of species found in the State: California and Texas, the one State having four times the area of New York, and the other five times that area, being the only ones which contain as large or a larger number of species.
For the purpose of fern classification, the State may be divided into four distinct zones, as follows:
The plan I have followed is to include along with the species only such varieties as seem to be most important and distinct.
Ophioglossaceae.
Osmundaceae.
Schizaeaceae.
Polypodiaceae.
Equisetaceae.
Isoetaceae.
Lycopodiaceae.
Salviniaceae.
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