. Fecundation in plants. Plant embryology; Plants, Sex in; Karyokinesis. 76 fecundation; non-motile isogametes. the others being disorganized; and in the desmids only two out of the four in the germination of the zygote develop into perfect cells. It is not known whether the reduction in the number of chromo- somes, if a reduction actually occurs in either desmids or diatoms, is in any way associated with the nuclear divisions in question, as has been assumed by some authors (see Wilson, "The Cell," p. 198) ; consequently, in the light of our present knowledge, it cannot be said with
. Fecundation in plants. Plant embryology; Plants, Sex in; Karyokinesis. 76 fecundation; non-motile isogametes. the others being disorganized; and in the desmids only two out of the four in the germination of the zygote develop into perfect cells. It is not known whether the reduction in the number of chromo- somes, if a reduction actually occurs in either desmids or diatoms, is in any way associated with the nuclear divisions in question, as has been assumed by some authors (see Wilson, "The Cell," p. 198) ; consequently, in the light of our present knowledge, it cannot be said with any certainty that these nuclear divisions represent a preparation for the sexual act, that in the diatoms taking place just before fecun- dation while in the desmids it occurs at the beginning of an ontoge- netic development. BASIDIOBOLUS. A sexual process similar to that in the Conjugatece is found in Basidiobolus, one of the Phycomycetes. I have selected Basidio-. 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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