A highly reducing polyketide synthase gene cluster from the Magnaporthe oryzae genome was previously identified to produce phytotoxic compounds including pyriculol. A homologous gene cluster was found in Neurospora crassa through bioinformatics analysis. Heterologous expression of this cluster led to the production of the salicylic aldehyde sordarial and related intermediates. A series of combinatorial gene expression experiments established the set of enzymes required to produce sordarial and the likely biosynthetic pathway.