. Fecundation in plants. Plant embryology; Plants, Sex in; Karyokinesis. 42 INTRODUCTION. kinoplasmic connecting fibers between the nuclei, and in the region of the cell-plate the cytoplasm seems undifferentiated. The plasma mem- branes, or cell-plates, which will separate the four spores, are laid down almost simultaneously. In the region where they are to appear the cytoplasm, as elsewhere, except near the nuclei, presents the same visible structure of alveolas, or perhaps a mixture of alveola and a thread-like network. Rather large and small meshes are Fig. i6.—CelUplate oiDi
. Fecundation in plants. Plant embryology; Plants, Sex in; Karyokinesis. 42 INTRODUCTION. kinoplasmic connecting fibers between the nuclei, and in the region of the cell-plate the cytoplasm seems undifferentiated. The plasma mem- branes, or cell-plates, which will separate the four spores, are laid down almost simultaneously. In the region where they are to appear the cytoplasm, as elsewhere, except near the nuclei, presents the same visible structure of alveolas, or perhaps a mixture of alveola and a thread-like network. Rather large and small meshes are Fig. i6.—CelUplate oiDictyoia dkhotoma and Siy^ocaulon. Kf portion of cell-plate from tetraspore mother-cell of Dictyota^ formed apparently by arrangement of alveolar lamellae into a continuous and even plane. B, same from apical cell of Sty^ocaulon,—(B, after Swingle.) The small-meshed structure is apparently more granular than that with larger meshes. * The first visible trace of a cell-plate is manifested by the transverse walls of the alveolae becoming perceptibly thicker and arranging them- selves in such a way as to appear as an uneven or somewhat zigzag line in section (Fig. i6, A). In this cell-plate primordium the walls of both large and small meshes take part. At first certain of the alve- olar lamellae are thinner than others, so that the cell-plate seems. 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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