What to know about death cap mushrooms, blamed for poisonings in California

Death cap mushrooms look similar to other edible varieties, but are highly poisonous. They grow near oak and other hardwood trees, usually in urban and suburban areas.

Death cap mushrooms look harmless, but are responsible for the majority of the world's mushroom-related deaths. California officials say 21 people have been sickened in recent weeks, one fatally.

(Image credit: William West)