One of the hardest balances to get right when fruiting mushrooms is humidity versus fresh air.

We have fruited lots of mushrooms where we see misshapen stalks or caps. Here are a few photos of what mushrooms look like when the carbon dioxide level is too high (probably around or over 2,000ppm).

Blue Oyster with wrinkled stalks
Pearl Oyster with elongated stalks
Blue Oyster with wrinkled stalks

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