. Elementary botany. Botany. 232 MORPHOLOG Y. size of the female nucleus before the fusion of the two takes place. In figs. 306 and 307 are shown the entering pollen tube with the sperm nucleus, and the fusion of the male and female nuclei. 457. Fertilization in plants is fundamentally the same as in animals.—In all the great groups of plants as represented by spirogyra, cedogonium, vaucheria, peronospora, ferns, gymno-. Two- and four-celled stage of embryo-sac of lilium. (Ea ' The middle one shows division of Fig- 3°4- -sac of lili nuclei to form the four-celled stage. (Easter lily.) sperms,
. Elementary botany. Botany. 232 MORPHOLOG Y. size of the female nucleus before the fusion of the two takes place. In figs. 306 and 307 are shown the entering pollen tube with the sperm nucleus, and the fusion of the male and female nuclei. 457. Fertilization in plants is fundamentally the same as in animals.—In all the great groups of plants as represented by spirogyra, cedogonium, vaucheria, peronospora, ferns, gymno-. Two- and four-celled stage of embryo-sac of lilium. (Ea ' The middle one shows division of Fig- 3°4- -sac of lili nuclei to form the four-celled stage. (Easter lily.) sperms, and in the angiosperms, fertilization, as we have seen, consists in the fusion of a male nucleus with a female nucleus. Fertilization, then, in plants is identical with that which takes place in animals. 458. Embryo.—After fertilization the egg develops into a short row of cells, the suspensor of the embryo. At the free end the embyro develops. In figs. 309 and 310 is a young embryo of trillium. 459. Endosperm, the mature female prothallium.—During the development of the embryo the endosperm nucleus divides. 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 Atkinson, George Francis, 1854-1918. New York, H. Holt
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