Today, most commercial varieties of this antibiotic are produced by the mold P. chrysogenum
[DOC] [TLE] Mold - Beneficial molds history - Production, Penicillium, Aflatoxin ... [PAR] The most common indoor molds are: Cladosporium, Penicillium, Alternaria, ... 
Two species have been used for the production of penicillin, the first antibiotic to 
be discovered: Penicillium notatum and Penicillium chrysogenum.