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Mystery smell reported across regions of Russia and Finland

https://www.independent.co.uk/news/world/europe/smell-helsinki-st-petersburg-finland-b2521318.html

A strange smell has been reported across the area

Mystery smell reported across regions of Russia and Finland

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The ones I'm thinking of grow on the rot inside birch trees and are hard, not slimy, and very slow growing so You're only supposed to sustainably take every 3rd one you come across. And if they're on a different tree, not birch, that's when the issues arise with toxicity. I am picturing it right now I just can't think of the name.

hydroptic

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Ahh right. Then it's probably one of the polypores, but there's a looooot of them.