Fomes fomentarius, also referred to as hoof fungus, tinder fungus, horsehoof tinder fungus, horse fungus, false tinder fungus, tinder conk, tinder polypore, and ice man fungus, is a fungal pathogen that infects various tree species. Hoof fungus produces distinct fruiting bodies that are generally shaped like a horse’s hoof. The pathogen infects susceptible trees through branch or bark wounds. Once established, the fungus causes a stem rot, which typically culminates in the death of the host. After the host has expired, the pathogen becomes a saprotroph, decaying the rest of the organic matter.