Origin of macrospore
Examples from the Web for macrospore
The macrospore divides into two cells, a large lower one, and a smaller upper one.Elements of Structural and Systematic Botany|Douglas Houghton Campbell
But the formation of the macrospore or embryo-sac is simpler than the corresponding process in cryptogams.
The nucellus is a cellular tissue enveloping one large cell, the embryo-sac or macrospore.
The larger ones contain each a large spore, or macrospore; the smaller contain numerous microspores, immersed in mucilage.The Elements of Botany|Asa Gray