Orbicules (syn. Ubisch bodies, con-peito grains) are small acellular structures of sporopollenin (known size range from < 1 µm to 15 µm, but usually sub-micrometre) that might occur on the inner tangential and radial walls of tapetal cells. Their function is unclear at this moment. Current consensus is that they are just a by-product of pollen wall sporopollenin synthesis.
- A photo of Nelumbo orbicules: Kreunen, S.S. & Osborn, J.M. (1999), "Figure 32", Pollen and Anther Development in Nelumbo (Nelumbonaceae), American Journal of Botany 86 (12): 1662–1676, doi:10.2307/2656664, JSTOR 2656664, PMID 10602759
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