In the gymnosperms the megaspore gives rise to a cell that is termed the embryo sac because of its similarity to the angiosperm structure. 在裸子植物中，大孢子也产生一个细胞，因为它类似于被子植物的胚囊细胞，故也可以称之为胚囊。
The gonads form from a group of large granulated yolk sac cells which invacle the germinal ridges. 性腺是由一群大的颗粒的卵黄囊细胞入缀生殖峭而形成。
