*  male reproductive organ is androecium and their unit is stamen . stamen is also known as microsporophyll.

* A typical stamen is differentiated into two parts - a long,thin structure is called FILAMENT. the proximal end of filament joins the stamen to the thalamus or petal. At distal end of filament a swollen microspore bearing structure is present which is called an Anther..

* Anther and filament or two anther lobes are attached together with help of region called connective. connective contains vascular tissues.

* The main part of stamen is Anther. each anther generally bilobed structure i.e., Anther has two anther lobes and each lobe of anther has two theca, it is called Dithecous.

* A typical anther has four microsporangia which develops into pollen sacs, it is called tetrasporangiate.

* Pollen grains are formred inside the pollen sac through the meiotic division of pollen Mother cell.

* In capsella which is the member of cruciferae or Brassicaceae, Anthers are dithecous and tetrasporangiate type.

* But in Malvaceae, the anther is Monothecous and bisporangiate. 

By :- Science knowledge