The inky cap, aka tippler’s bane, Coprinopsis atramentaria, is a real mushroom that causes nausea and vomiting when eaten with alcohol. It’s a delicious edible mushroom otherwise.
@dextersTomato - button mushrooms or champignons exist in the wild as well. The domesticated types aren’t different from the wild type; they are all Agaricus bisporus.
All that said, readers, unless you’re experienced or have the help of an experienced mushroom hunter, please don’t pick and eat a wild mushroom because it looks like an mushroom you’ve seen in stores...