. Our ferns in their haunts; a guide to all the native species. Ferns. THE WOOD FERNS. 145 the disposition of certain specimens. Generally speak- ing, it may be said that the variety intermedium is rather longer, narrower and more finely cut than the type, with the under surface minutely glandular. The young fronds are frequently so sticky from these glands that they adhere to the paper when pressed for the her- barium. It is our commonest form and is abundant in nearly all moist woods. The vari- ety dilatatum is an \ \ ~\^'p''Kr V"-*"" upland or mOUn- a pinnule. Much enlarged.
. Our ferns in their haunts; a guide to all the native species. Ferns. THE WOOD FERNS. 145 the disposition of certain specimens. Generally speak- ing, it may be said that the variety intermedium is rather longer, narrower and more finely cut than the type, with the under surface minutely glandular. The young fronds are frequently so sticky from these glands that they adhere to the paper when pressed for the her- barium. It is our commonest form and is abundant in nearly all moist woods. The vari- ety dilatatum is an \ \ ~\^'p''Kr V"-*"" upland or mOUn- a pinnule. Much enlarged. tain form, at least in the southern part of its range. It is more inclined to be ovate and the inferior pinnules on the lowest pair of pinnEe are conspicuously elongated. The principal points that are depended upon for separat- ing the forms may be contrasted as follows:— In true spinulosum the scales of the stipe are pale brown, the blade ovate-lanceolate, the pinna oblique to the rachis and the indusium glabrous. In the variety interniediuin the scales of the stipe are brown with a darker centre, the blades oblong-ovate, often rather narrow, the pinnae spreading, the indusium ragged edged and dotted with stalked glands. In the variety dilatatum the scales of the stipe are larger, brown with a dark centre, the blade broadly ovate, the lower pinnules much lengthened and the indusium glabrous. It may be noted in passing that in Great Britain where dilatatum is common, and frequently regarded as a dis-. 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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