Structure of mature female gametophyte
1. The female gametophyte is formed from the contents of megaspore. However, it always remains embedded within the membrane of the megaspore.

2. The mature female gametophyte is 7-celled (An egg, two synergids, three antipodals and a central cell).

3. Out of 7 cells of mature female gametophyte, the egg cell fuses with male gamete to form zygote, one synergid degenerates and the other synergid directs the pollen tube entry, the central cell fuses with the male gamete to form triploid primary endosperm nucleus and the three antipodals degenerate before or after fertilization.

4. They sometimes act as antipodal haustoria.