Anther is generally
Monosporangiate
Bisporangiate
Hexasporangiate
Tetrasporangiate
As we learn
Structure of Anther -
The anther is a four-sided (tetragonal) structure consisting of four microsporangia located at the corners, two in each lobe. The microsporangia develop further and become pollen sacs. They extend longitudinaly all through the length of an anther and are packed with pollen grains.