pseudogamous gametophytic apomixis, or in autonomous gametophytic apomixis endosperm fertilization is not required.
* In diplospory (also called generative apospory), the megagametophyte arises from a cell of the archesporium.
* In apospory (also called somatic apospory), the megagametophyte arises from some other (somatic) cell of the nucellus.

Considerable confusion has resulted because diplospory is often defined to involve the megaspore mother cell