. Our ferns in their haunts; a guide to all the native species. Ferns. 198 THE POLYPODIES. cristatum with pinnules variously forked and crested. i\ form from West Virginia has recently been described as P. vulgare deceptuin. It differs from the common form in being somewhat larger with narrower, pointed pinnae. This was earlier considered a mere form and named biscrratum. Considering the unimportant differ- ences it displays, the earlier view seems the correct one. In North America the polypody is found from Alabama to the far north and northwestward. Its natural habi- tat is upon rocks but it
. Our ferns in their haunts; a guide to all the native species. Ferns. 198 THE POLYPODIES. cristatum with pinnules variously forked and crested. i\ form from West Virginia has recently been described as P. vulgare deceptuin. It differs from the common form in being somewhat larger with narrower, pointed pinnae. This was earlier considered a mere form and named biscrratum. Considering the unimportant differ- ences it displays, the earlier view seems the correct one. In North America the polypody is found from Alabama to the far north and northwestward. Its natural habi- tat is upon rocks but it is occasionally found upon trees and logs where the atmosphere is moist. In the moister climate of England, it is said to be very commonly found on trees. In our western States, it is rare or absent, but its place is taken by several allied species that much resemble it. It is a tough and hardy species able to en- dure great extremes of temperature and is found in nearly all parts of the The Gray Polypody. The little gray polypody {Polypo- dmm incanuni) may be termed a strag- gler into our territory from a warmer region. It is most abundant in the Tropics, where it grows on rocks, trees, walls and even on the roofs of the houses. In the northern pnrt of its range, it is usually found on rocks or about the roots of CiRAV POLYPODY. Polypoifiii in iiicanmn. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Clute, Willard Nelson, b. 1869. New York, F. A. Stokes Co
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