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What is a macrospore?

What is a macrospore? Here are some definitions.

Noun
  1. One of the specially large spores of certain flowerless plants, as Selaginella, etc.
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The macrospore divides into two cells, a large lower one, and a smaller upper one.
The nucellus is a cellular tissue enveloping one large cell, the embryo-sac or macrospore.
But the formation of the macrospore or embryo-sac is simpler than the corresponding process in cryptogams.
Fertilization in advanced plants is preceded by pollination, during which pollen is transferred to, and establishes contact with, the female gamete or macrospore.

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