I've never seen these, but I have heard of them. I just don't know that I would trust a mushroom that I didn't get at a market, as a kid I used to always hear about 'poisonous toadstools'. (But I do love what I get at the store, in fact, I'm picking some up to sautee' with some scallops I got while diving this weekend. MMMMMMMMMMMMMmmmmmmmmmmm!)