penicillium subtile penicillium subtile penicillium subtile is a species of fungus in the genus penicillium. penicillium subtile scientific classification kingdom: fungi division: ascomycota class: eurotiomycetes order: eurotiales family: trichocomaceae genus: penicillium species: p. subtile binomial name penicillium subtileberkeley, m.j. 1841