The megagametophyte within the ovule of a flowering plant.

胚囊 Embryo sac 有花植物胚珠内的雌配。

Macrospore metrocyte of Pinus sylvestris var. mongolica developed to female gametophyte containing female gamete-egg by a series of changes.

松大孢母细胞经一系列变化，发育成雌配。