Gymnosperm trees have both pollen and ovulation cones located right next to one another. The microsporocytes are then divided by meiosis forming haploid microspores which then develops into a pollen grain. When the pollen reaches the ovule pollination then occurs and it is germinated forming a pollen tube that digests through the megaspoangium. During the process in which the pollen tube is developing the megasporocyte undergoes meiosis producing four haploid cells with only one moving on to become a megaspore. The megaspore becomes the female gametophyte which then starts to hold the eggs. Once the eggs are mature and they are covered in sperm they are then put in a protective coating of nutrients (seed) and released.