This is one subject i would be VERY careful with! You mess up, you can easily die - simple as that.
I hear that it is a long painful death as well - Liver failure is a bitch. Do you know of anyone around who has any background in Mycology? See if you can't get one of those earthy-crunchy type Mycologist to go for a walk in the field with you to "Point out" the different species. Good luck!
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"I dislike the drug you are using, but I would defend with my life your right to use it."
- Paraphrase on Voltaire
"He who makes a beast of himself gets rid of the pain of being a man."
- Dr. Johnson
"We do not sense imagination enough to sense what we are missing."
-Jean Toomer