Abstract
FOR many years it has been generally assumed by botanists that in Angiosperms, as in the heterosporous Pteridophytes, the megaspores are larger than the microspores. In a study of megaspore development in Œnothera rubricalyx (Gates and Sheffield),1 it was incidentally discovered that this is not the case. Series of measurements showed that the corresponding absolute values were about 4930μ3 for the ‘mega-spore’ mother-cell and 12,630μ3 for the ‘microspore’ mother-cell at the end of meiosis. The need for comparative measurements of the size of the spores in the pollen and ovules of various plants was pointed out, and brief reference was made to the possible significance of the above condition.
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