The microgametophyte, like that of the conifer is enclosed in the pollen grain. Microgametophyte contains a total of 3 cells. Tube nucleus controls the growth of pollen tube.
Many angiosperms have different methods, however.
For our purposes in here, we will only describe this most common type. The mature megagametophyte is much smaller in terms of numbers of cells when compared to conifers, for example. There are no archegonia. There is only one egg. There are only a few very specialized cells all of which have names.