E-Flora BC: Electronic Atlas of the Flora of British Columbia

Summary:
This is "a striking fungus that forms beautiful coremia on a number of different insects" (Beug(3)). A coremium is a type of structure that produces conidia (asexual spores). The teleomorph is unknown but according to Dictionary of the Fungi, 10th Edition, the anamorphic genus is associated with the Cordycipitaceae.

Distribution is widespread, and Isaria farinosa from BC, WA, and OR is included in the USDA-ARS Collection of Entomopathogenic Fungal Cultures.

Fruiting body:
The coremia growing from the insect are typically about 0.1-0.2cm high x 0.03-0.07cm wide "with irregularly ovoid heads" (Beug).

Microscopic:
The conidia are 1-2.5 x 1-1.5 microns, oval to nearly round, and colorless (Beug).