The microspore mother cells undergo meiosis, and the cytokinesis is simultaneous.The tetrads are tetrahedral.Mature pollen grains are two-celled at the dispersal stage.

• 小孢子母细胞减数分裂后胞质分裂为同时型，四分体为四面体型排列，成熟的花粉粒为二细胞型。