Beauveria Vuill., 1912

Beauveria is a genus of asexually-reproducing fungi allied with the ascomycete family Cordycipitaceae. Its several species are typically insect pathogens. The sexual states (teleomorphs) of Beauveria species, where known, are species of Cordyceps sensu stricto.

Beauveria species are white entomopathogenic fungi. They form unicellular conidia that are typically hydrophobic and very small. The conidia are formed holoblastically from basally inflated conidiogenous cells. After conidium production, the conidiogenous cell elongates before producing another conidium atop a small denticle (a narrow projection bearing a conidium or sporangium). The result is the formation of a distinctive, slender, zig-zag rachis. Colonies of Beauveria species are typically white or off-white on artificial culture media.

Species of Tritirachium resemble Beauveria species in having a zig-zag conidiogenous cells, but differ in lacking conspicuous denticles and in producing yellow-brown to purple colonies.

Beauveria species are commonly found associated with insects or habitats supporting insects, including soil and private dwellings. B. bassiana, the most widely known member of this genus, has been developed as a biological pesticide for various insect pests.