A 5.5-year-old, male, feline leucosis virus-positive cat developed a c
oncurrent dermatophytosis due to Microsporum canis and a subcutaneous
infection due to Staphylotrichum coccosporum. St. coccosporum caused m
ycetoma-like lesions. The fungal elements revealed features like those
seen in phaeohyphomycosis. Until now St. coccosporum has been describ
ed to be non-pathogenic. The pathogenicity of St. coccosporum was corr
oborated by experimental infection.