. Heredity and evolution in plants. Heredity; Plants. 12 HEREDITY AND EVOLUTION IN PLANTS equal degree, as in the case of Polypodium mentioned above. In some species, however, there are two kinds of leaves—one devoted entirely to vegetative functions, and another to the reproductive, or spore-producing function (Fig. 14); between these two extremes all grades of transi- tion are found (Fig. 15). But however widely the sporo-. FiG. 14.—The cinnamon fern {Osmiinda cinnamomea), showing foliage' leaves and sporophylls. phyll departs from a foliage-leaf in appearance, it must, nevertheless, be rega
. Heredity and evolution in plants. Heredity; Plants. 12 HEREDITY AND EVOLUTION IN PLANTS equal degree, as in the case of Polypodium mentioned above. In some species, however, there are two kinds of leaves—one devoted entirely to vegetative functions, and another to the reproductive, or spore-producing function (Fig. 14); between these two extremes all grades of transi- tion are found (Fig. 15). But however widely the sporo-. FiG. 14.—The cinnamon fern {Osmiinda cinnamomea), showing foliage' leaves and sporophylls. phyll departs from a foliage-leaf in appearance, it must, nevertheless, be regarded as morphologically a leaf. As partial evidence of the true foliar nature of sporophylls, there may be cited the interesting experiment of Atkinson, who, by removing the true foliage-leaves just beginning to unfold in the spring, was able to induce developing sporo- ' phylls to alter their character, and become transformed. 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 Gager, C. Stuart (Charles Stuart), 1872-1943. Philadelphia, P. Blakiston's Son & Co.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectplants, bookyear1920
