Amanita muscaria

Amanita muscaria was a fungus native to the subarctic climates of Earth. It was poisonous, and ingesting it could cause profuse sweating, convulsions, and acute delirium. The Vikings knew it as the atuta, a powerful plant they boiled into broth and consumed before battle for spirit.

In 2371, The Doctor identified an Amanita muscaria to Freya in the Beowulf holodeck program.