. Morphology of gymnosperms. Gymnosperms; Plant morphology. 204 MORPHOLOGY OF GYMNOSPERMS and occasionally a multinucleate cell is observed; but in mature endosperm tissue the cells are uninucleate. Whether this is due to disorganization or fusion of nuclei, or to additional wall-formation, was not determined. Centripetal growth of the endosperm is rapid through July and August, the sac being filled with tissue by the last week of August. In the closure of the tissue at the center of the sac, there is no formation of a common wall, but two distinct abutting walls are formed, so that even in th
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