Read a mushroom textbook 30-years ago, so take this as you will, but it's damned easy to test.
Chip a tiny chunk off with your tooth. Wait 45-mintues. Heart burn, feel weird? Stop. No? Take a bigger chunk. Rinse and repeat.
People act like the tiniest bit of fungus will kill them dead. Not unless your liver has failed, and then you got worse problems.
Anybody know how to trip on Aminata Muscaria? Sure is a lot in the woods around here.