. Botany; an elementary text for schools. Plants. 168 GERMINATION 291. Sprout- ing Indian corn. Hi- lum at h ; mieropyle at d. !I2. Kernel of Indian corn. Caulicle at b; cotyledon a ; plumule 287). The beau "comes up" with a loop, which indicates that the hypocotj-l greatly elongates. On examining a germinating seed, however, it will be found that the cotyledons are contained inside a fleshy body or sac («, Fig. 288). This sac is the en- dosperm. To its inner surface the thin, veiny cotyledons are ver}" closely appressed, absorbing its substance (Fig. 289). The cotyledons increa
. Botany; an elementary text for schools. Plants. 168 GERMINATION 291. Sprout- ing Indian corn. Hi- lum at h ; mieropyle at d. !I2. Kernel of Indian corn. Caulicle at b; cotyledon a ; plumule 287). The beau "comes up" with a loop, which indicates that the hypocotj-l greatly elongates. On examining a germinating seed, however, it will be found that the cotyledons are contained inside a fleshy body or sac («, Fig. 288). This sac is the en- dosperm. To its inner surface the thin, veiny cotyledons are ver}" closely appressed, absorbing its substance (Fig. 289). The cotyledons increase in size as they reach the air (Fig, 290), and become functional leaves. 315. GERMINATION OF INDIAN CORN.—Soak kernels of corn. Note that the mieropyle and hilum are at the smaller end (Fig. 291). Make a longitudinal section through the narrow diameter ; Fig. 292 shows it. The single cotyledon is at a, the caulicle at b, the plumule at p. The cotyledon remains in the seed. The food is stored both in the cotyledon and as endosperm, chiefly the lat- ter. The emerging shoot is the plumule, with a sheath- ing leaf ip, Fig. 293). The root is emitted from the tip of the caulicle, c. The caulicle is held in a sheath (formed mostly from the seed-coats), and some of the roots escape through the ^_ upper end of this sheath {m, Fig. tp^^V^^^'" 293). The epicotyl elongates, par- '^f(^w^ ticularly if the seed is planted deep or if it is kept for some time confined. In Fig. 294 the epicotyl has elon- gated from n to p. The true plumule-leaf is at o, but other leaves grow from its sheath. In Fig. 295 the roots. 293. Indian corn. Caulicle at c : roots emerging at m; plumule at 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 Bailey, L. H. (Liberty Hyde), 1858-1954. New York, Macmillan Co.
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