A new species, Eupenicillium bovifimosum, was isolated from dry cow manure collected in Wyoming, USA. The outstanding morphological characteristics of this species are its robust, dense penicilli bearing long, broad columns of conidia, and its smooth-walled, unflanged ascospores which are produced within 3 wk of inoculation onto MEA. The new species produces penicillic acid, a fumagillin-like molecule, patulodin-like compounds CK2108A and CK2108B, and a compound resembling 2-[(2-hydroxypropionyl)amino]benzamide. Phylogenetic analysis using 1100 bases of the ITS and LSU DNA regions indicates that E. bovifimosum is most closely related to E. baarnense, and also to E. crustaceum, E. egyptiacum, and E. tularense.