Gizzard lesions by mycosis: Mycoses are often caused by Aspergillus, Penicillium and Fusarium, fungi present in the feed; or are a consequence of an excessive use of antibiotics. Necrotic lesions can be observed in the gizzard corneal layer, together with white plates of fungi growing between the corneal and muscular layers. These white formations can easily be observed when the corneal layer is removed, as in the picture.