DEAR AMY: I have a group of three friends (we’re all male) with whom I enjoy one overnight each month at a cabin in the woods. We take turns cooking. Recently two of the guys made a spaghetti dinner for us. The next morning they told us that they had included mushrooms in the sauce that they had found behind the woodpile. I was horrified. I have a degree in biology and taught environmental science for over 30 years – neither of these guys has experience with mycology or taxonomy of fungi – nor could they even name the species of mushrooms that were used. When I expressed my dismay, they were d…