. Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. Fig. 17.—Stangeria paradoxa, longitudi- nal section of ovule, x 1: g, embryo Biio containing endosperm; s, layer of "sporogenous tissue" around the em- bryo sac; jD, pollen chamber.—After Fig. 18.—Zamia integrifolia\ longitudi- nal section of upper end of nueellus, showing pollen tubes growing down into the archegonial chamber: pt, pol- len tubes; pc^ pollen chamber; pg, rem- nant of pollen grain.—After Webber. fact especially evident when one lifts off the caplike nucellar beak, which from t
. Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. Fig. 17.—Stangeria paradoxa, longitudi- nal section of ovule, x 1: g, embryo Biio containing endosperm; s, layer of "sporogenous tissue" around the em- bryo sac; jD, pollen chamber.—After Fig. 18.—Zamia integrifolia\ longitudi- nal section of upper end of nueellus, showing pollen tubes growing down into the archegonial chamber: pt, pol- len tubes; pc^ pollen chamber; pg, rem- nant of pollen grain.—After Webber. fact especially evident when one lifts off the caplike nucellar beak, which from the disorganization of the tissue beneath be- comes quite 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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