. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. NUCLEAR CYCLE IN DESMIDS AND DIATOMS 7i the fusion-nucleus soon follows (Fig. 40. 2, 3): this is succeeded by further mitosis (Fig. 40. 4), with the result that four nuclei are formed : two of these are larger than the other two, and a pair of nuclei of unequal size, one small the other large, finds its place in each of the two cells into which the zygote divides (Fig. 40. 5, 6). Of these nuclei the smaller one in each cell disappears, and it is thought that it becomes disorganised, while the other re
. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. NUCLEAR CYCLE IN DESMIDS AND DIATOMS 7i the fusion-nucleus soon follows (Fig. 40. 2, 3): this is succeeded by further mitosis (Fig. 40. 4), with the result that four nuclei are formed : two of these are larger than the other two, and a pair of nuclei of unequal size, one small the other large, finds its place in each of the two cells into which the zygote divides (Fig. 40. 5, 6). Of these nuclei the smaller one in each cell disappears, and it is thought that it becomes disorganised, while the other remains as the definitive nucleus of the new Closterium cell. Certain Diatoms show on conjugation a singular parallelism of behaviour to this, but with important differences, and again it is to Klebahn that we owe the description of the In the conjugation of Rhopalodia. 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 Bower, F. O. (Frederick Orpen), 1855-1948. London, Macmillan and Co. , Ltd.
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