about 400 species
Cordyceps is a genus of ascomycete fungi (sac fungi) with about 400 species. Most Cordyceps species are parasitoids. They are parasitic mainly on insects and other arthropods. A few are parasitic on other fungi. The generic name Cordyceps is taken from the Greek word κορδύλη kordýlē, meaning "club", and the Latin stem -ceps, meaning "head".
The genus has a worldwide distribution. Most of the 400 species have been described from Asia (notably Nepal, China, Japan, Bhutan, Korea, Vietnam, and Thailand). Cordyceps species are particularly abundant and diverse in humid temperate and tropical forests.