. Morphology of angiosperms (Morphology of spermatophytes. Part II). Angiosperms; Plant morphology. 144 MORPHOLOGY OF ANGIOSPEEMS the pollen-grain with its pollen-tube and some contents, as well as the ovule with its integuments and embryo-sac; and the pollen-tube had been traced from the stigma to the Fig. 65.—A-C, Orchis Mono; D, 0. latifolia; E, 0. maculata; F, Carina limbata. A-B, young ovules, x 150; 0, end of pollen-tube enlarging, x 100; Z), later stage with two nuclei visible in embryo, x 166; £, more advanced embryo, x 208; i7, considerably later stage, x 1'25.—After Scha
. Morphology of angiosperms (Morphology of spermatophytes. Part II). Angiosperms; Plant morphology. 144 MORPHOLOGY OF ANGIOSPEEMS the pollen-grain with its pollen-tube and some contents, as well as the ovule with its integuments and embryo-sac; and the pollen-tube had been traced from the stigma to the Fig. 65.—A-C, Orchis Mono; D, 0. latifolia; E, 0. maculata; F, Carina limbata. A-B, young ovules, x 150; 0, end of pollen-tube enlarging, x 100; Z), later stage with two nuclei visible in embryo, x 166; £, more advanced embryo, x 208; i7, considerably later stage, x 1'25.—After In 1835 Schleiden, the founder of the cell-theory, traced the pollen-tube in a large number of widely separated families. He claimed to have seen the tube enter the micropyle, press into the embryo-sac, and then become itself the embryonal vesicle, the beginning of the embryo. He thought that the contents of the pollen-tube not only give rise to the embryonal vesicle, but that the end of the tube, nourished by the embryo-sac, becomes the future 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 Coulter, John Merle, 1851-1928; Chamberlain, Charles Joseph, b. 1863. New York, D. Appleton
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