A small, granular structure that is found in the extracellular matrix of cell of the secretory tapetal layer that surrounds developing pollen grains. Ubisch bodies have a sporopollenin coat, are attached to the peritapetal wall, and may play a role in pollen development. [ http://www.ncbi.nlm.nih.gov/pubmed/14612572 http://www.ncbi.nlm.nih.gov/pubmed/16524248 ]