Abstract
A new Penicillium species, P.tricolor, morphologically similar to P. aurantiogriseum and allied species, was isolated from red spring wheat and durham wheat grains in Saskatchewan and Manitoba. Penicillium tricolor is classified in Penicillium subg. Penicillium and is characterized by the following combination of diagnostic characters: tuberculate conidiophore stipes, greyish turquoise smooth conidia, orange-brown exudate droplets and colony reverse, and production of the mycotoxins xanthomegnin, viomellein, vioxanthin, terrestric acid, and the alkaloids rugulosuvine, leucyltryptophanyldiketopiperazine, verrucofortine, puberuline, and asteltoxin. Key words: Penicillium tricolor, taxonomy, wheat, mycotoxins.
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