. Nature and development of plants. Botany. 326 SPORANGIA OF FILICALES leaves. Therefore, Bower estimates that the shield fern produces annually upwards of 50 million spores. This makes a striking comparison when we consider the spore production in the Bryo-. FlG. 223. Section of a leaf of Woodwardia, showing two sori: i, indusium; sp, sporangia arising from the epidermis and in various stages of develop- ment. Note the epidermis, stoma, j, palisade and spongy chlorenchyma. and vascular bundles, as in higher plants. phyta, and it is evident that ample provision is made for the maintenance of t
. Nature and development of plants. Botany. 326 SPORANGIA OF FILICALES leaves. Therefore, Bower estimates that the shield fern produces annually upwards of 50 million spores. This makes a striking comparison when we consider the spore production in the Bryo-. FlG. 223. Section of a leaf of Woodwardia, showing two sori: i, indusium; sp, sporangia arising from the epidermis and in various stages of develop- ment. Note the epidermis, stoma, j, palisade and spongy chlorenchyma. and vascular bundles, as in higher plants. phyta, and it is evident that ample provision is made for the maintenance of the race notwithstanding the postponement and specialization in spore production. The sporangia vary considerably in structure in the various. 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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