Four Phenolics from the Cultured Lichen Mycobiont of Graphis scripta var. pulverulenta.

From the cultures of the spore-derived mycobionts of the lichen Graphis scripta var. pulverulenta, four phenolic compounds, graphislactones A-D, were isolated. Their structures were determined by spectroscopic methods. This is the first instance of the isolation of 6H-dibenzo[b, d]pyran-6-one derivatives from the lichen mycobiont.