. Fundamentals of botany. Botany. 494 STRUCTURE AND LIFE HISTORIES tains endosperm, with the embryo located at one side (Figs. 378 and 83). The cotyledon {scutellum) serves to secrete enzymes that digest the endosperm, and then. Fig. 378.—^Lonitudinal section of a grain of wheat (Triticum vulgarc). p.s.c, pericarp and s'eed-coats (united); en, endosperm; al, aleurone layer; gl, glandular layer of the scutellum; sc, scutellum; sp, sheath of plumule (coleoptile); pi, plumule; r.cot., rudimentary cotyledon; ra, radicle; re, root-cap; r.s., root-sheath {coleorhiza). (From microscopical preparation

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. Fundamentals of botany. Botany. 494 STRUCTURE AND LIFE HISTORIES tains endosperm, with the embryo located at one side (Figs. 378 and 83). The cotyledon {scutellum) serves to secrete enzymes that digest the endosperm, and then. Fig. 378.—^Lonitudinal section of a grain of wheat (Triticum vulgarc). p.s.c, pericarp and s'eed-coats (united); en, endosperm; al, aleurone layer; gl, glandular layer of the scutellum; sc, scutellum; sp, sheath of plumule (coleoptile); pi, plumule; r.cot., rudimentary cotyledon; ra, radicle; re, root-cap; r.s., root-sheath {coleorhiza). (From microscopical preparation of E. W. Olive.) absorb the digested food by osmosis (Fig. 62). The cylin- drical stems are jointed and usually hollow (except at the joints). The leaves are usually long, slender, and parallel-. 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 work.. Gager, C. Stuart (Charles Stuart), 1872-1943. Philadelphia, P. Blakiston's son & co.