jack-o'-lantern

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jack-o'-lantern,

common name for the mushroommushroom,
type of basidium fungus characterized by spore-bearing gills on the underside of the umbrella- or cone-shaped cap. The name toadstool is popularly reserved for inedible or poisonous mushrooms, but this classification has no scientific basis.
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 species Clitocybe illudens.