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the fruiting body of any of a variety of fleshy fungi of the order Agaricales, especially one that is edible. Poisonous species are popularly called toadstools.
mushroom poisoning poisoning resulting from ingestion of mushrooms; potentially deadly mushrooms include Amanita phalloides, A. verna, A. virosa, and certain other species that contain neurotoxins. Rapid identification of mushroom poisoning and treatment is critical. According to the Center for Food Safety and Applied Nutrition of the Food and Drug Administration, persons who have ingested poisonous mushrooms and are treated immediately have a mortality rate of 10 per cent, whereas those who are treated 60 or more hours later have a 60 to 90 per cent mortality rate.
A fungus with an umbrella-shaped fruiting body, especially one thought to be inedible or poisonous.