. Botany for high schools and colleges. Botany. G YMNOSPERM^. 405 the first root of the its whole root sys- tem. The cotyle- dons haying thus far been in contact with the e n d 0 - sperm, which fur- nished them with nourishment, now elongate and push out their bases, and in some cases even- tually withdraw themselves entirely from the seed coat (Fig. 300, ///.). The apex of the axis (plumule) be- gins a rapid growth, which gives rise to a leafy stem resem- bling that of the parent 2:)lant, al- though usually somewhat sim]3ler. 515.—The tis- sues of the Gymno- sperms are individ- ually but litt
. Botany for high schools and colleges. Botany. G YMNOSPERM^. 405 the first root of the its whole root sys- tem. The cotyle- dons haying thus far been in contact with the e n d 0 - sperm, which fur- nished them with nourishment, now elongate and push out their bases, and in some cases even- tually withdraw themselves entirely from the seed coat (Fig. 300, ///.). The apex of the axis (plumule) be- gins a rapid growth, which gives rise to a leafy stem resem- bling that of the parent 2:)lant, al- though usually somewhat sim]3ler. 515.—The tis- sues of the Gymno- sperms are individ- ually but little high- er than those of the Pteridophytes, but in the mode of their aggregation they present great and important differ- ences, in this latter respect bearing a close resemblance to the tissues of the Dicotyledons among new plant, and eventually gives rise to. Fig. 300.—Seeds of Finus Piiiea in different stages of germination. /., ripe seed in lonp-itndinal section; «, the seed coat; e, endosperm ; w, tne hypocotyledonary axis of embryo ; c, cotyledons ; y. the micropylar end of the seed, with the root of the embryo directed to- wards it. 7/., //., four views of the beginning of ger- mination ; A, external view ; B. with half of the seed coat removed ; C, in longitudinal section; D, in transverse section ; .*, seed coat; 1\ red membrane lin- ing the seed coat; <?. endosperm ; c, cotyledons ; w, root ; a;, ruptured embryo sac. ///., germination com- plet<i, the cotyledons, c, unfolding, and the hypoctyle- donary stem. ?ic, elongating ; w, the main root, devel- oping lateral roots, iv'.—MiQr Sachs. the Angiosperms. The three tissue sys-. 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 Bessey, Charles Edwin, 1845- [from old catalog]. New York, H. Holt and company
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