biosynthetic gene cluster of the fungal meroterpenoid chrodrimanin B (4) was discovered in Penicillium verruculosum TPU1311, and the complete biosynthetic pathway of 4 has been elucidated by heterologous reconstitution of itsbiosynthesis in Aspergillus oryzae, as well as by in vitro characterizations of selected enzymes. The present study has identified the polyketide synthase that produces 6-hydroxymellein