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orbicule
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.
==External links==
*A photo of ''Nelumbo'' orbicules:
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「orbicule」の詳細全文を読む
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