Archesporium, megagametophyte mother cell (MMC) Secondary sporogenous cell, pollen mother cell (PMC)
II MMC meiosis, dyad PMC meiosis, dyad and tetrad
III Tetrad Dyad, tetrad
IV Functional megaspore, uninucleate embryo sac Uninucleate microspore, first mitosis
V Binucleate embryo sac Premature or mature 2-cell pollen grains
VI Premature multi-nucleate embryo sac Mature pollen grain
VII Mature 8-nucleate embryo sac Mature pollen grain