Today, most commercial varieties of this antibiotic are produced by the mold P. chrysogenum
[DOC] [TLE] Fleming's penicillin producing strain is not Penicillium chrysogenum ... [PAR] Jun 7, 2011 ... Penicillium chrysogenum is a commonly occurring mould in indoor environments 
and ... Phylogenetic analysis of the most important penicillin producing P. ... for its 
use in the production of the antibiotic penicillin (Samson et al.