Morphology and Relationships of a New Species of Microsomyces (Ascomycetes: Laboulbeniales) from Illinois

Microsomyces telephani, a new species of Laboulbeniaceae, is described from collections found on Telephanus velox (Coleoptera: Cucujidae) from Illinois. Features of development and maturity of the new species are illustrated with photographs and line drawings. Microsomyces telephani differs from the type and previously only known species of the genus, M. psammoechi, in its larger, more highly corticated receptacle, which bears secondary appendages, and in its larger primary appendage, which typically bears several antheridial phialides. Among known genera of Laboulbeniales, Microsomyces is thought to be most closely related to Cucujomyces