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[L. penicillum, brush]
A genus of molds belonging to the Ascomycetes (sac fungi). They form the blue molds that grow on fruits, bread, and cheese. A number of species (P. chrysogenum, P. notatum) are the sources of penicillin. Occasionally in humans they produce infections of the external ear, skin, or respiratory passageways. They are common allergens.
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