Today, most commercial varieties of this antibiotic are produced by the mold P. chrysogenum
This 
Penicillium species, Penicillium chrysogenum grew so well in a tank that it more 
than ... of P. chrysogenumby Mary Hunt made the commercial production of... [DOC] [TLE] Penicillin and other antibiotics [PAR] The production of penicillin by the fungus has created a zone of growth ... culture 
filtrates of Penicillium notatum or the closely related species P. chrysogenum are 
... species, have yielded most of the antibiotics used in clinical medicine today.