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I recently started a brown oyster mushroom grow kit. It came with a plastic sleeve for keeping moisture in until pinheads form. After a large mushroom emerged, I removed the sleeve. This morning, I noticed that splits have appeared on top of the mushroom:

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Are these splits benign, or do they indicate that the mushroom has too little moisture? If this is an indication of dehydration, what is the best way to fix it?

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