Cercospora beticola, Cercospora coryli
Cercospora leaf spot of hydrangea
Cercospora is a genus of ascomycete fungi. Most Species have no known sexual stage, and when the sexual stage is identified, it is in the genus Mycosphaerella. Most species of this genus cause plant diseases, and form leaf spots. It is a relatively well-studied genus of fungus, but there are countless species not yet described, and there is still much to learn about the best-known of the species.