. Fecundation in plants. Plant embryology; Plants, Sex in; Karyokinesis. COLEOCHjETE. qj tion. In the withdrawal of the chloroplast into the base of the egg- cell, and the formation of a receptive spot, Coleochcete is paralleled by both CEdogonium and Vaucheria. Soon after entering the oogonium the spermatozoid penetrates the egg, a membrane is formed about the latter, and the sperm-nucleus wanders toward that of the egg (Fig. 33, F). Before final fusion takes place, one or more changes occur in the egg, which may be worth noting. The chloroplast which lay at the bottom of the Fig. 33.—F
. Fecundation in plants. Plant embryology; Plants, Sex in; Karyokinesis. COLEOCHjETE. qj tion. In the withdrawal of the chloroplast into the base of the egg- cell, and the formation of a receptive spot, Coleochcete is paralleled by both CEdogonium and Vaucheria. Soon after entering the oogonium the spermatozoid penetrates the egg, a membrane is formed about the latter, and the sperm-nucleus wanders toward that of the egg (Fig. 33, F). Before final fusion takes place, one or more changes occur in the egg, which may be worth noting. The chloroplast which lay at the bottom of the Fig. 33.—Fecundation in ColeochtEtepulvinaia.—(After Oltmanns.) E, mature oogonium, egg rounded off. F-H, odgonia with fecundated eggs ; male nucleus in F applied to that of egg; both nuclei in resting stage. G, a little later than F ; the chloroplast has taken a lateral position in egg. H, fusion of sexual nuclei complete. as previously stated, divides, and the two resulting chloroplasts take positions on opposite sides of the egg (Fig. 33, G). The egg and, consequently, the ventral part of the oogonium increase in size ; in the former vacuoles appear, and the nuclei which are in the resting con- dition fuse completely (Fig. 33, H). For the further behavior of the oospore and its germination, which, as is well known, bears a tolerably close resemblance to such liver- worts as Riccia, the reader is referred to the original papers of Pringsheim and 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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