Abstract
apices from aerial hyphae. The clavate conidiophore apex or vesicle is not usually produced by P. citreoviride, however, Citromyces sormanii Carbone, an organism described as having simple or branched conidiophores that broaden to a clavate apex, was regarded as a possible synonym of P. citreoviride (4). Pitt (3) placed P. citreoviride in synonymy with Penicillium citreonigrum Dierckx and described the conidiophores as being nonvesiculate. He observed that the species most closely related to P. citreonigrum is probably Penicillium miczynskii Zaleski, which produces metulae. It is interesting to note that sclerotigenic strains of P. miczynskii {^Penicillium pedemontanum Mosca & Fontana) are known producers of citreoviridin (2, 5). NRRL 13013 also produces small sclerotia on Czapeks agar. This is the first observation of sclerotium production in Penicillium citreo? viride. I do not believe that the differences between NRRL 13013 and P. citreo?
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