Plants and Animals
Botany
Botany: General
megaspore

megaspore

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views updated Jun 08 2018

megaspore The larger of two kinds of spore produced by heterosporous ferns, or the first cell of the female gametophyte generation of such ferns and seed plants (angiosperms and gymnosperms). In angiosperms, it is one of 4 haploid cells formed from a megasporocyte during meiosis, the other 3 degenerating. The megaspore of angiosperms divides to produce the female gametophyte (embryo sac).

A Dictionary of Plant Sciences MICHAEL ALLABY

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megaspore

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views updated May 23 2018

megaspore See megaspore mother cell; sporophyll.

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megaspore

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megaspore See SPORE.

A Dictionary of Earth Sciences AILSA ALLABY and MICHAEL ALLABY

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