British Columbia is home to many popular edible mushrooms like chanterelles, morels, and matsutake. There are also beautiful mushrooms, like the charismatic Amanita muscaria (known as fly agaric), and psychedelic "magic mushrooms" as well. The best season for picking mushrooms in British Columbia is the fall, but edible mushrooms can usually be found all year round.  Vancouver Island is a particularly excellent location in British Columbia for learning about and foraging mushrooms. 

This site - Westcoastforager.com - is a resource for would-be mushroom hunters and foragers to learn about the best that Vancouver Island has to offer. While the information here is focused on Vancouver Island, it should apply to British Columbia and the wider Pacific Northwest area as well.  

Vancouver Island is home to a number of highly poisonous mushrooms, including Death Caps (Amanita phalloides), Smith's Amanita (Amanita smithiana), and Deadly Galerina (Galerina marginata). It's important to be aware of these and other deadly fungi so that you can be 100% sure of an identification before eating any mushroom.