. Nature and development of plants. Botany. 394 SPOROPHYTE OF ANGIOSPERMS nuclei, thus forming the endosperm nucleus through a triple fusion. While this process is probably in the nature of a rein- forcement, enabling the endosperm nucleus to perform its work, it is noteworthy that the qualities of the male parent are trans-. FiG. 273. Section of the micropylar end of the megasporangium, show- ing the process of fertilization. The tube, t, has passed through the micro- pyle, entered the female gametophyte and ruptured, discharging the male cells. One, d', is shown fusing with the female gamete
. Nature and development of plants. Botany. 394 SPOROPHYTE OF ANGIOSPERMS nuclei, thus forming the endosperm nucleus through a triple fusion. While this process is probably in the nature of a rein- forcement, enabling the endosperm nucleus to perform its work, it is noteworthy that the qualities of the male parent are trans-. FiG. 273. Section of the micropylar end of the megasporangium, show- ing the process of fertilization. The tube, t, has passed through the micro- pyle, entered the female gametophyte and ruptured, discharging the male cells. One, d', is shown fusing with the female gamete, 9, and the other one, d", is uniting with the two polar nuclei, thus making a triple fusion in the formation of the endosperm nucleus; s, one of the synergids; i, integu- ments. mitted to the endosperm cell just as though this fusion were a sexual process. 127. The Germination of the Gametospore.—^After fertiliza- tion the endosperm nucleus divides repeatedly, and usually the resulting nuclei become arranged about the walls of the sac-like gametophyte which may now be called the embryo sac (Fig. 274). Later the endosperm cells develop walls and by further division completely fill the embryo sac with cells. This mass of cells is called the endosperm and the method of its development is exactly similar to that of the female gametophyte of the gym-. 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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