Psilocybe semilanceata, commonly known as the Liberty Cap, is a small mushroom that contains the psychoactive compound psilocybin. It typically grows in grassy fields and meadows, particularly in areas with rich soil. The mushroom has a distinctive conical cap that can range in color from yellow-brown to greenish, and it often has a characteristic nipple-like protrusion at the top. This species is one of the most widely distributed and potent psychedelic mushrooms in the world. It is primarily found in temperate regions of Europe and North America, especially during the fall months. Due to its psychoactive properties, it has been used in various cultural and spiritual practices throughout history.