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Erwin F Smith
Dickson 155 Vavilov 161 Vavilov 167 Borodin
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Agriculture algae anaphase angiosperms anthers apical cell appears archegonia association autotrophic average bacteria Bursa carpels cent characters chromatin classification climate Congress of Plant conifers corn crops culture cytological dioecious diploid disease distribution effect embryo embryo initials embryogeny evidence Experiment Station experimental fact factors ferns fertilization Figure flora flowers forest fossil gametes gametophyte genetic genus germination growing growth gymnosperms habitat haploid hybrids important initial root International Congress investigation irradiated Ithaca leaf method micr moisture morphological nature nuclei oats observed obtained occur organs origin oxidation period pine Pinus Plant Sciences plastids plots pollen polyembryony potometers present probably produced protoplasm radium radium emanation reduction division region resistant rosette Russian rust season Section seed seedlings sexual similar soil species sporangia spores sporophyte stage stem structure suspensor TABLE tion trees trenched United variability variation varieties vegetation wheat yield