. Botany for high schools. Botany. Fig. 377- Podophyllum peltatum, ovule containing mature embryo sac; two synergids, and eggs at left, endosperm nucleus in center, three antipodal cells at right. the embryo sac. At first there are four nuclei at the outer end (next the micropyle, called the micropylar end of embryo sac), and four at the base (called the antip- odal end). But soon one nucleus from each pole (called polar nu- clei) of the embryo sac moves to the center, where they fuse to form the primary endosperm nucleus of the endosperm. This leaves three nuclei in each end of the embryo sac
. Botany for high schools. Botany. Fig. 377- Podophyllum peltatum, ovule containing mature embryo sac; two synergids, and eggs at left, endosperm nucleus in center, three antipodal cells at right. the embryo sac. At first there are four nuclei at the outer end (next the micropyle, called the micropylar end of embryo sac), and four at the base (called the antip- odal end). But soon one nucleus from each pole (called polar nu- clei) of the embryo sac moves to the center, where they fuse to form the primary endosperm nucleus of the endosperm. This leaves three nuclei in each end of the embryo sac. The three at the base are called antipodals. They usually soon degenerate. The three at the micropylar end are called together the egg apparatus. The two nearest the micro- pylar end are called the synergids, which means helpers or co- workers, because it was once thought they assisted the pollen. Fig. 378. Macrospore Tone-celled stage) of 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 and Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
