. Biological series. Biology. Fig. 6.—Nuclei from the nutritive layer of Aulacidea nabali Brodie. Fig. 7.—Cell division In the epidermis and cortex of Neolasioptera perfoliata Felt. The Beginning of Gall Development. In some species of galls that originate from stems, veins or petioles, the eggs of the producer are deposited within the tissues of the host in or near the cambium zone. Adler and Kiistenmacher have detected eggs actually placed in that region, and while my own observations in the case of Cynips? constricta Stebbins were made on older develop- mental stages, yet the nature and arr
. Biological series. Biology. Fig. 6.—Nuclei from the nutritive layer of Aulacidea nabali Brodie. Fig. 7.—Cell division In the epidermis and cortex of Neolasioptera perfoliata Felt. The Beginning of Gall Development. In some species of galls that originate from stems, veins or petioles, the eggs of the producer are deposited within the tissues of the host in or near the cambium zone. Adler and Kiistenmacher have detected eggs actually placed in that region, and while my own observations in the case of Cynips? constricta Stebbins were made on older develop- mental stages, yet the nature and arrangement of the tissues were such as would seem to preclude any other conclusion. The origin of this gall from the vein is shown in Fig. 53. In leaf galls that are produced in the blade as Rhodites lenticularis Bass. (Fig. 63), a cambium is differentiated in the mesophyll into which, in this case, the egg is iuvserted. Two inde- pendent observers, Beyerinck and Weidel, have demonstrated beyond a doubt, however, that the egg is in some cases placed on the epidermis of the host, and consequently there are at least two distinct methods of 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 University of Toronto; Toronto, Ont. University. University of Toronto studies. Biological series. Toronto University Press [etc. ]
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