Some Mushrooms can grow from decomposing animals.
Would there be any (kashrus) problems with having mushrooms that grow from the carcasses of non-kosher animals?
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I heard from one of the Star- K Rabbis. In the name of Rav Heineman that it depends on whether all its nutrients are from the dead animal. The Cordyceps mushroom which in nature is complelty dependent on the catappilar it takes over is not kosher because kol hayotzim meihatami tamei. Though at the time only cordyceps mushroom was described as not kosher so I am not sure if there is any other mushroom it applies to.