conch
noun
the spiral shell of a gastropod, often used as a horn.
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P. conchate, woolly, digitately lobed, white then yellowish ochre, glabrous, hygr. fragile, fixed by a narrow lateral point; g. densely and acutely dentato-serrate; sp. glob. 3-3.5.
From European Fungus Flora: Agaricaceae by George Massee