SUMMARY: Examination of the antibiotic powers towards bacteria and moulds of 150 strains of yeasts from the British National Collection of Yeast Cultures has revealed that whereas none exhibited marked antibacterial properties certain of them inhibited the growth of moulds. Strains of when grown on a malt + yeast + peptone + glucose agar medium inhibited the growth of strains of certain and spp. The inhibition was due to pulcherriminic acid, a derivative of the red pigment, pulcherrimin, formed by . It inhibited growth of the moulds completely at 5000 p.p.m. and partially at 500 p.p.m.


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