. A textbook of botany for colleges and universities ... Botany. 234 MORPHOLOGY The three genera differ widely in this regard, and therefore must be considered separately. Ephedra. —The female gametophyte is developed as in other gymno- sperms, with free nuclear division (up to 256 nuclei), parietal wall formation, centripetal growth, and differentiation of the endosperm into distinct micropylar and antipodal regions. In this case, however, the antipodal tissue (nutritive) is rela- tively small-ceUed and compact, and the micropylar tissue is more loosely organized and has thinner walls. In thi
. A textbook of botany for colleges and universities ... Botany. 234 MORPHOLOGY The three genera differ widely in this regard, and therefore must be considered separately. Ephedra. —The female gametophyte is developed as in other gymno- sperms, with free nuclear division (up to 256 nuclei), parietal wall formation, centripetal growth, and differentiation of the endosperm into distinct micropylar and antipodal regions. In this case, however, the antipodal tissue (nutritive) is rela- tively small-ceUed and compact, and the micropylar tissue is more loosely organized and has thinner walls. In this loose micropylar tissue usually two archegonia are formed, their very long, many-tiered necks extend- ing to the pollen chamber described. 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; Barnes, Charles Reid, 1858-1910, joint author; Cowles, Henry Chandler, 1869- joint author. New York, Cincinnati [etc] American book company
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