Brain fungus

 is a consumable in Fallout 4.

Characteristics
This strange, green, and wrinkly fungus provides ten hit points, but also increases radiation by 3. It is used in creating Mentats at a chemistry station.

Locations

 * Relatively common in enclosed, dark spaces, particularly the underground.
 * The following map contains all the spawn locations on the world map (excluding interiors or harvested items)