Knopper galls/Weird alien acorns

 

For Halloween!

I saw these knopper galls in Luxembourg…they look like a weird alien sucking on the acorn, but they’re actually just an outgrowth of the acorn caused by a humble gall wasp called Andricus quercuscialicis (say that three times fast). It’s a European thing, and I don’t think anything similar exists in North America…I’ve certainly never come across one myself!

Knopper Galls
Knopper Galls

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2 thoughts on “Knopper galls/Weird alien acorns

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