the best thing to do is take a course. edwards gardens (in the don) used to have a course a few years ago. not sure if it is still around. dufferin forest does have a course but it has past. plus you got to book well ahead of time. it sells out every year, and there is a waiting list.
Discovering Mushrooms – Alliston, ON
Join renowned naturalist, Bob Bowles, on this mushroom identification walk and learn how mushrooms grow, where they grow, how to identify them, their relationship with trees and the soil, and what species are edible. Cost: $10. Pre-registration required. For more information or to register contact Caroline Mach at 705-435-1881.