Cordyceps
Cordyceps is a genus of ascomycete fungi (sac fungi) with about 400 species. Most Cordyceps species are parasitoids. They live on and in insects and other arthropods. A few are parasitic on other fungi. The name Cordyceps is taken from the Greek word κορδύλη kordýlē, meaning "club", and the Latin stem -ceps, meaning "head".