megaspore

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mac·ro·spore

(mak'rō-spōr),
The larger of two spore types of certain protozoans or fungi.
Synonym(s): megalospore, megaspore
[macro- + G. sporos, seed]

megaspore

or

macrospore

the larger of two types of SPORES produced by many ferns and seed plants. The megaspore gives rise to a female GAMETOPHYTE in ferns and in seed plants, and in flowering plants becomes the EMBRYO SAC. Compare MICROSPORE.