The morphology of Termitaria coronata Thaxter was studied by scanning and transmission electron microscopy. The plates of T. coronata can be found on all parts of the body of the termite, particularly on the antenna, on the head and the legs. The sub-base consists of thousands of independent chlamydospores (haustorium mother cell), the majority showing a haustorium, able to perfore the cuticle of the termite. At the base of haustorium the chlamydospore presents two concentric valves. Their three-dimensional morphological structure is shown for the first time by this study.