. Our ferns in their haunts; a guide to all the native species. Ferns. 140 THE WOOD FERNS. nules which are crenulate or finely serrate. Occasionally the pinnules nearest the rachis are separate. Fertile fronds sometimes reach a height of three feet and a width of six inches, but these dimensions are rare. The sori are borne in a double row on each pinnule and the in- dusium is broad, thin and conspicuous. A fruiting pin- nule is illustrated in the Key to the Genera. The rootstock is of medium size, horizontal and Aspidium cristatuiu. Middle pinnae. The crosiers are covered with broa
. Our ferns in their haunts; a guide to all the native species. Ferns. 140 THE WOOD FERNS. nules which are crenulate or finely serrate. Occasionally the pinnules nearest the rachis are separate. Fertile fronds sometimes reach a height of three feet and a width of six inches, but these dimensions are rare. The sori are borne in a double row on each pinnule and the in- dusium is broad, thin and conspicuous. A fruiting pin- nule is illustrated in the Key to the Genera. The rootstock is of medium size, horizontal and Aspidium cristatuiu. Middle pinnae. The crosiers are covered with broad, light-brown scales, many of which remain on the stipes after the blade has unfurled. This species is very sensitive to varying amounts of light and the pinnse, especially those of the fertile frond, have the trick of assuming a nearly horizontal position like slats in a blind, to accommodate themselves to the illumination. In fronds that do not naturally receive sufificient light, the individual pinnae will twist around until at the proper angle. Even when a frond is fastened with the upper side down, they will manage to turn so as to face the light. The crested fern is found from northern Canada to North Carolina, Arkansas and Idaho and occurs again in Europe and Asia. Its favourite haunt is the woodland. 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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