Gyrometrin toxin is produced by the false morel (Gyromitra esculenta), a short-stalked mushroom with a brain-like cap of dark brown color. Fruiting bodies of this mushroom appear mostly in spring and are valued as edible, even as delicacies. While many people consume the mushroom without any troubles, others become ill, some of them severely. It has been shown that the toxin content may vary with growth conditions, such as altitude and temperature. More probably, however, the variation is caused by differences in handling or cooking as the toxic components are volatile. The toxin has been detected in cooked, frozen, and dried specimens.
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