Fomes is a genus of fungi that primarily includes wood-decaying species. These fungi are known for their ability to break down lignin and cellulose in wood, contributing to the decomposition process in forests. They often appear as shelf-like structures on trees and logs, playing a crucial role in nutrient cycling within ecosystems. One of the most recognized species within this genus is Fomes fomentarius, commonly known as the tinder fungus. This species has been used historically for starting fires and has medicinal properties. Fomes fungi are important for maintaining forest health by recycling nutrients back into the soil.