Abstract
It will be necessary to classify fossil pollen on a level of species instead of genus for the purpose to obtain more accurate knowledges of paleoflora, paleoecology, paleoclimate and detailed correlation of sediments in which the pollen is contained. In this case, the size of pollen grains is considered to be important for the identification, particularly for the differentiation of a number of species within the same genus. It seems, however, that much prudence is apparently required in the treatment of the size of fossil pollen. In the present paper, the writer would like to show, with some illustrations of Tertiary specimens, that the size is not inherent for the pollen, but it changes after deposition even in a same genus by such factors as (1) chemical treatments to take out fossil pollen from sediments in which the pollen is contained, and (2) sedimentary conditions under which the pollen deposited.
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