Penicillium rubens

Penicillium rubens is a species of fungus belonging to the genus Penicillium. This fungus is closely related to P. notatum and P. chrysogenum, and has sometimes been considered the same species. While P. notatum was initially believed to be the source of the antibiotic penicillin discovered by Alexander Fleming, subsequent research identified the mold as P. rubens. However, the strain Fleming identified was not ideal for industrial production. During World War II, large-scale penicillin production utilized P. chrysogenum due to its high yield. Penicillium species are economically significant for producing antibiotics like penicillin, organic acids, and are used in cheese production.123