generative cell
Figure 32.7 Pollen develops from the microspore mother cells. The mature pollen grain is composed of two cells: the pollen tube cell and the generative cell, which is inside the tube cell. The pollen grain has two coverings: an inner layer intine and an outer layer exine . The inset scanning electron micrograph shows Arabidopsis lyrata pollen grains. credit pollen micrograph: modification of work by Robert R. Wise; scale-bar data from Matt Russell .