. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 329 by an indusium that is laterally attached at a single point (Fig. 222, A). The Christmas fern, Polystichum, has a circular sorus with centrally attached indusium (Fig. 225, C). The spleenwort fern, Asplenium, is characterized by elongated sori arranged obliquely to the midrib upon the upper side of the veinlets. The indusium is attached on one side of the sorus along its entire length (Fig. 222, B). The chain fern, Woodwardia, differs from Asplenium in having the sori arranged in chain-like rows. Fig. 226. Ferns without indu
. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 329 by an indusium that is laterally attached at a single point (Fig. 222, A). The Christmas fern, Polystichum, has a circular sorus with centrally attached indusium (Fig. 225, C). The spleenwort fern, Asplenium, is characterized by elongated sori arranged obliquely to the midrib upon the upper side of the veinlets. The indusium is attached on one side of the sorus along its entire length (Fig. 222, B). The chain fern, Woodwardia, differs from Asplenium in having the sori arranged in chain-like rows. Fig. 226. Ferns without indusia or possessing false ones: A, leaflet of bracken fern, Pteridium. B, maiden-hair fern, Aiiantum. C, polypod fern, Polypodium.—^After Sprague. parallel to its midrib (Fig. 225, B). In several genera of ferns the indusium is partly or entirely inferior. Thus in the bladder fern, Filix, the partly inferior indusium covers the circular sorus like a hood (Fig. 225, D), while it is wholly inferior in the hay- scented fern, Dennstaedtia, forming a cup (Fig. 225, E) and in Woodsia the indusium is roundish or star-like (Fig. 225, F).. 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 Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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