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Hi, sorry to annoy you with stupid questions again, but I have not found an answer to this problem anywhere. A friend of a friend has this casing that has had a lot of mutations on the first flush (maybe verticillium) but after dunking in ~ 0.5% H2O2 there have only been perfectly formed mushrooms and it is now on its seventh flush. The problem is that a lot of mushrooms are growing on the sides of the container and there are little brown spots on the base of some of the larger mushrooms where they are squashed against the container, like in the image below:
The spots don't give off color when rubbed with a tissue and alcohol but are easily scraped off with a knife and there is only healthy mushroom tissue under the spots and on the inside of the stems. After a few flushes these spots are becoming more numerous and he really would like to know what that is and if it is poisonous, even though at one time he ate three of those discolored stems with no ill effects.