What mold grows penecillin?

Penicillin is produced by the mold Penicillium chrysogenum. This species of mold was discovered by Alexander Fleming in 1928, leading to the development of the first antibiotic. Penicillium chrysogenum thrives in damp environments and can often be found on decaying organic matter. The antibiotic properties of penicillin arise from the mold's natural defense mechanism against bacteria.