the spore-bearing fruiting body of a fungus, typically in the form of a rounded cap on a stalk, especially one that is believed to be inedible or poisonous.
Joseph: "Hey, Nick."
Joseph: "Can I eat toadstool?"
Nick: "No, we can't eat toadstool."
Joseph: "Why?"
Nick: "Mushroom poisoning, also called toadstool poisoning, toxic, sometimes fatal, effect of eating poisonous mushrooms."