Brain Mushroom (Gyromitra esculenta): Also called a false morel, brain mushrooms grow caps that resemble the shape of a brain and its sulci. Though most concentrated in Britain and Ireland, the obscurely shaped toadstool can also be found throughout Europe and North America. It's especially partial to growing in the coniferous woodlands of mountainous regions. They can sometimes be mistaken for true morels (hence the nickname) because they share the trait of irregular lobes. However, the impersonator has more lobes and none of the true morel's signature craterlike pits.