. Embryogenesis in plants. Embryology. 290 EMBRYOGENESIS IN PLANTS In addition to the zygotic embryos, otlier embryos may not infre- quently be formed from the synergids (with or without the intervention of a male nucleus), or from the antipodals—a more rare Fig. 80. Examples of polyembryony A, B, Ulmiis americana. Normal and antipodal embryos (after Shattuck). C, Ery- throitium aniericanum. Proliferation of embryonic mass with formation of several embryos (after Jeffrey). D, E, Eiilophea epidendraea. D, The zygote has formed a group of cells, three of which have given rise to ind
. Embryogenesis in plants. Embryology. 290 EMBRYOGENESIS IN PLANTS In addition to the zygotic embryos, otlier embryos may not infre- quently be formed from the synergids (with or without the intervention of a male nucleus), or from the antipodals—a more rare Fig. 80. Examples of polyembryony A, B, Ulmiis americana. Normal and antipodal embryos (after Shattuck). C, Ery- throitium aniericanum. Proliferation of embryonic mass with formation of several embryos (after Jeffrey). D, E, Eiilophea epidendraea. D, The zygote has formed a group of cells, three of which have given rise to independent embryos. E, A bud has been formed on the right-hand side of the embryo (after Swamy). F, Elatostema simiatum eusinuatum. A zygotic embryo and three antipodal embryos (one undergoing its first division). G, Elatostema eurhynchum. Zygotic and lateral embryos. H, Elatostema acuminatum. Compound embryo-sac formed by the fusion of two embryo-sacs; that on the right has two well developed embryos; ihat on the left has two small embryos (F-H, after Fagerlind). Tn Ulmus americana (Urticales; Ulmaceae), the antipodal nuclei have often an egg-like appearance and embryos are sometimes formed in their vicinity (Shattuck, 1905), Fig. 80a, b. Antipodal embryos have also been found in Ulmus glabra (Ekdahl, 1941), Allium odorum (Liliaceae) (Modilewski, 1931), Sedum fabaria (Saxifragales: Cras- sulaceae) (Mauritzon, 1933), and Elatostema sinuatum eusinuatum. 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 Wardlaw, C. W. (Claude Wilson), 1901-. London, Methuen; New York, Wiley
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