Cytochrome P450 monooxygenase; part of the gene cluster that mediates the biosynthesis of pleosporalin A, ascomycone A, as well as a third cryptic naphthoquinone derived pigment, all responsible for the coloration of conidia (PubMed:28471414, PubMed:35351612). Involved in the oxidation of fusarubinaldehyde at C-9. PgmC has low substrate-specificity and is also able to use the pgmA product 3-acetonyl-1,6,8-trihydroxy-2-naphthaldehyde as a substrate (PubMed:35351612). The pathway begins with the biosynthesis of the cyclized heptaketide 3-acetonyl-1,6,8-trihydroxy-2-naphthaldehyde by the NR-PKS pgmA. The C-6 hydroxyl group is further methylated by the O-methyltransferase pgmB to yield fusarubinaldehyde which is in turn oxidized by the cytochrome P450 monooxygenase pgmC at C-9. The C-1 hydroxyl group is then methylated spontaneously. Although pgmE, pgmD and pgmH are essential for the production of pleosporalin A, it is not the case for the 2 other final products and it remains difficult to assign a specific function to each enzyme. PgmF and pgmG seem not to be involved in pigment biosynthesis although they were regulated by the cluster-specific transcription factor pgmR (PubMed:35351612) (Probable). Pigment biosynthesis. Secondary metabolite biosynthesis. Expression is significantly up-regulated at the end of late growth phase, in the presence of Butyrolactone I (PubMed:28471414). Expression is positively regulated by the pgm cluster-specific transcription factor pgmR (PubMed:35351612). Abolished completely the production of the naphthoquinones derived pigments and leads to the accumulation of fusarubinaldehyde, the methylated product of pmgB. Belongs to the cytochrome P450 family.