ou might be asking yourself - "What is the Penis Envy Cubensis; what's with the weird name?" The truth of the matter is simple. This psychedelic mushroom has the shape of a penis, no two ways about that. What you might not know is that this mushroom is among the most powerful ones in the world, in terms of its psychotropic potential. The word around town goes that the Penis Envy Cubensis was engineered by Terence McKenna, from the Psychonauts.