That's true to an extent, but some families (agaricaceae and boletaceae come to mind) are found pretty much everywhere, and their edible members are easy to ide

That's true to an extent, but some families (agaricaceae and boletaceae come to mind) are found pretty much everywhere, and their edible members are easy to identify. Do you have a source for that? I would be surprised if the majority of poisonings (in the USAS, say) are travelers.