Production of clavine alkaloids rugulovasines by P. variabile did not depend on the habitat of the producers. During submerged cultivation on a simple synthetic medium in early growth stages, microcyclic conidiation was observed in the tested fungi; its presence or absence, as well as the activity of the cultures as to biosynthesis of rugulovasines, depended on the composition of the culture medium. On a complex medium supplemented with peptone, conidiation occurred but was considerably suppressed. Conidia were completely absent in the medium supplemented with yeast extract. In both cases, no appreciable amounts of rugulovasines were detected.