The megaspore is the first cell of the female gametophyte. The lowermost megaspore develops into a female gametophyte just after pollination. After pollination the functional megaspore enlarge in size and then it undergoes repeated division and then develops into a multicellular female gametophyte. 2-8 archegonia develop at the micropylar end; the mature archegonium has venter and a neck in which the venter encloses an egg.
