Cordyceps
Cordyceps is a genus of ascomycete fungi that includes about 600 species. Most Cordyceps species are endoparasitoids, parasitic mainly on insects and other arthropods; a few are parasitic on other fungi. The generic name Cordyceps is derived from the Greek word κορδύλη kordýlē, meaning "club", and the Greek word κεφαλή cephali, meaning "head". The genus has a worldwide distribution and most of the approximately 600 species that have been described are from Asia. Cordyceps species are particularly abundant and diverse in humid temperate and tropical forests.