anther has 2 lobes . each lobe has 2 theca n each theca has 2 microsporangium .. then there should be 6 microsporangium ... but there are 4 ... where am I going wrong ?

A typical angiosperm anther has two parts, an anther and a slender, thread like filament. Each anther is a bilobed structure, i.e., it has two lobes, and each lobe is dithecous i.e., has two theca. Each theca has a mass of sporogenous tissue which develops into microsporangium or pollen sac. Thus, there are two lobes, each with two theca, and each theca has one microsporangium. In total, there are four microsporangia in an anther.