Once inside the ovule, pollen grains germinate to form a pollen tube. Most Conifers produce Ovules in cones. The unit structures in conifers are compound. They contain a leaf bract and a highly reduced stem called a scale. This is called the bract scale complex.
Meiosis takes place in one cell within each sporangium.
This results in four haploid Megaspores . Three of these degenerate . The remaining megaspore divides to produce a gametophyte . The Megagametophyte develops within diploid tissue which is called the Nucellus . The gametophyte grows at the expense of the Nucellus which is largely consumed in this process.