Dear all, we found these empty cylindrical cocncretions in severals ponds and lakes from different mountain range in Uzbekistan.

Any ideas of what it could be ?

The pictures have been took under binoculare lens (the structure are from 0.1 mm to 0.5 mm).

May be a root concretion of Cyperaceae or other hydrophytes from the ponds ?

Thank you for your help,

Lucas

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