I said it before, but it is worth repeating. More than a few quite knowledgeable mushroom enthusiasts have been fatally poisoned. My friend the mycologist said he would be content to limit himself to the commercially available ones
Here is a URL to a site about false morels, which vary greatly in the amount of poison in them so that they may be eaten without any symptoms, but for unknown reasons at other times may cause fatal poisoning. http://nt2.advant.com/kuocgi2/morels/introduction.html