. Fecundation in plants. Plant embryology; Plants, Sex in; Karyokinesis. l62 ARCHEGONIATES. the first division of the fusion nucleus in Ginkgo biloba (Fig. 67, A, B, C, D). These processes agree closely with those in Cycas. In Ginkgo^ however, the male nucleus at the time of fusion is relatively small, being less than one-tenth the size of the female nucleus. As in Cycas and Zamia, the male nucleus becomes completely imbedded in. Fig. 67.—Formation of ventral canal-cell, fusion of sexual nuclei, and the division of the fusion nucleus in Ginkgo.—(After Ilceno.) A, apex of central cell of archeg
. Fecundation in plants. Plant embryology; Plants, Sex in; Karyokinesis. l62 ARCHEGONIATES. the first division of the fusion nucleus in Ginkgo biloba (Fig. 67, A, B, C, D). These processes agree closely with those in Cycas. In Ginkgo^ however, the male nucleus at the time of fusion is relatively small, being less than one-tenth the size of the female nucleus. As in Cycas and Zamia, the male nucleus becomes completely imbedded in. Fig. 67.—Formation of ventral canal-cell, fusion of sexual nuclei, and the division of the fusion nucleus in Ginkgo.—(After Ilceno.) A, apex of central cell of archegonium showing telophase of nuclear division; a cell-plate, or plasma membrane, is formed in the connecting libers. B, egg-nucleus into which a male nucleus (m) has penetrated. C, fusion nucleus in prophase of division. D, fecundated egg-cell showing fusion nucleus in spindle stage of mitosis ; the mitotic figure lies within limits of the nucleus whose membrane seems to be still intact, the female before the dissolution of its membrane. Both nuclei are in the resting condition at the time of fusion. The spindle of the first karyokinesis following fusion is formed within the nuclear cavity and before its membrane has disappeared (Fig. 67, B, C, D). Nothing is said by Ikeno about being able to distinguish male and female chromatin elements in this 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 Mottier, David Myers. [Washington] The Carnegie Institution of Washington
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