The Blue Ghost Psilocybe cubensis is a rare and visually striking variant of the well-known Psilocybe cubensis species, celebrated for its vivid blue bruising reaction. Like other Psilocybe cubensis strains, it contains the psychoactive compounds psilocybin and psilocin, which induce hallucinogenic effects. However, the Blue Ghost stands out due to its intense blue discoloration when bruised or injured, a phenomenon caused by the enzymatic oxidation of psilocybin into psilocin and subsequent oligomerization into quinoid compounds.