This kind of mushroom is poisonous, you can't eat it.
Tips
usage
毒 is extremely versatile. As a noun it means 'poison/toxin,' as an adjective 'poisonous/malicious,' and in compounds like 吸毒 (take drugs) and 消毒 (disinfect).
history
The character combines 母 (mother) on top and 毋 (don't) — ancient idea of something nurturing that turns harmful.