The megagametophyte within the ovule of a flowering plant.

胚囊 Embryo sac 有物胚珠内的雌配子体。

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

摘樟子松大孢子母细胞经变化，发育成雌配子体。