A typical anther of a stamen contains four microsporangia where the microsporangia form sacs or pockets (locules) in the anther (anther sacs or pollen sacs).
A stamen typically consists of a stalk called the filament and an anther which contains microsporangia. A typical anther contains four microsporangia. The microsporangia form sacs or pockets (locules) in the anther (anther sacs or pollen sacs). 
