At the stage of tetrad, the anther wall was composed of epidermis, endothecium and tapetum. |
At the stage of anther dehiscence, there was one-layer anther wall of endothecium and the tapetal layer was digested completely to nourish the pollen grains. |
On maturation of the anther, the sporangial wall consists of the epidermis and the endothecium, whereas the middle layers and tapetum disintegrate. |