Abstract
Abstract In 31 species of Acer different deviative pollen grains with a quite regular arrangement of apertures were found. Tetrads with a different structure were also found. It was shown that no single dependence between structure of tetrad and arrangement of deviative pollen exists. Deviative pollen forms with a similar arrangement of apertures were also found in distant angiosperm families but only in those which usually have 3-colpate pollen grains.
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