. Nature and development of plants. Botany. Fig. 256. Development of the young sporophyte or embryo: 2, diagram of a section of a megasporangium, showing the formation of elongated sus- pensory cells and numerous embryos, e; i, integument; sp, sporangium nearly consumed by the growth of the gametophyte; g, gametophyte, the central portion of it disorganized by growth of embryos, e. 3/I, section of a nearly mature embryo; s, suspensor; r, root cap; c, cotyledons; st, stem. 3B, external view of embryo. which become surrounded by cell walls save in the case of the lower plate, which is in direct
. Nature and development of plants. Botany. Fig. 256. Development of the young sporophyte or embryo: 2, diagram of a section of a megasporangium, showing the formation of elongated sus- pensory cells and numerous embryos, e; i, integument; sp, sporangium nearly consumed by the growth of the gametophyte; g, gametophyte, the central portion of it disorganized by growth of embryos, e. 3/I, section of a nearly mature embryo; s, suspensor; r, root cap; c, cotyledons; st, stem. 3B, external view of embryo. which become surrounded by cell walls save in the case of the lower plate, which is in direct contact with the rich food of the spore (Fig. 255, C-D). This meager growth corresponds to the. Fig. 257. Sectional view of pine seed: i, hard integument; g, gameto- phyte, often called the endosperm, which has completely consumed the spor- angial tissues. The embryo consists of a root, r, ensheathed in a large root cap, cotyledons, c, and stem, 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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