A typical dithecous anther in angiosperms is:
An anther is a knob-like fertile part of the male reproductive organ in flowering plants. Generally, a longitudinal groove runs lengthwise separating the theca (sheath or covering) in a typical anther. A transverse section of this typical anther shows four chambers called microsporangia. Such an anther is termed tetrasporangiate.
Unisporangiate, bisporangiate and trisporangiate anther will have one, two and three microsporangium respectively.