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 w...
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http://en.wikipedia.org/wiki/Orbicule
(from the article `igneous rock`) The term orbicular is applied to rounded, onionlike masses with distinct concentric layering that are distributed in various ways through otherwise ...
Found on
http://www.britannica.com/eb/a-z/o/26
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