Bonnet mushrooms is a fungus that contains small amounts of muscarine, making it poisonous. All parts, including the stem, gills, and cap, are toxic. Ingesting even small amounts can cause stomach distress, with symptoms like diarrhea and nausea. While usually not life-threatening, toxicity increases with alcohol consumption, making the fungi inedible for humans. Confusion with edible mushrooms is common. Bonnet mushroomssummaryToxic levels increase with alcohol. All parts are poisonous.