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The original post had asked if others had more information 
on/reactions to possible gluten cross contamination of mushrooms 
which are sometimes grown on wheat or rye straw or seeds. Most 
replied that I may have an intolerance/allergy to the mushrooms 
themselves since they have that problem. However, a few were 
intrigued about the possibility of cross contamination as they were 
not aware that mushrooms were sometimes grown on wheat seeds and 
straw. Only the seeds have the gluten so the straw is not a problem 
unless there are seeds in the straw and they somehow get into the 
mushroom harvest collection system..

My conclusion:

Perhaps, I'm reacting to some mushrooms but not others rather than a 
cross contamination issue. I like mushrooms so eat them but now I'll 
focus on which types cause the reactions. If the same type of 
mushrooms cause the problem sometimes but not other times then I'll 
check into how they are grown to see if there might be a gluten 
contamination problem. If only those farms using wheat seeds as a 
substrate are the problem then I'll avoid that brand and post my findings.

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