Lectotypification and status of Isaria Pers. : Fr.

The nomenclatural status and history of the generic name Isaria are reviewed. Authorship and typification are discussed, and we conclude that Isaria Pers. : Fr. is a validly published generic name that has previously been effectively and appropriately lectotypified by Isaria farinosa (Holm : Fr.) Fr. A lectotype illustration and an epitype specimen are designated for I . farinosa . We suggest that the name Isaria be used for species previously assigned to Paecilomyces section Isarioidea Samson. Further taxonomic studies are required to determine the appropriate circumscription of Isaria . Our conclusions preserve a Friesian genus in a familiar sense.