penicillium radicicola penicillium radicicola penicillium radicicola is a species of fungus in the genus penicillium which produces roquefortine c and occurs on onions. penicillium radicicola scientific classification kingdom: fungi division: ascomycota class: eurotiomycetes order: eurotiales family: trichocomaceae genus: penicillium species: p. radicicola binomial name penicillium radicicolaovery, d.p.; frisvad, j.c. 2003