Cercosporoid fungi including the genus Cercospora and other morphologically similar genera are important pathogens causing leaf spots on a wide range of host plants. In a taxonomic study on cercosporoid fungi, plants with leaf spot symptoms from different localities of Mazandaran province were collected and examined during spring-autumn 2011-12. As the result, Cercospora hostae (on Hostaalbomarginata), Pseudocercosporacydoniae (on Chaenomelesjaponica)and Stigmina palmivora (on Washingtonia robusta and Phoenixcanariensis) are reported here as new records for Iran. Hibiscus syriacus is a new host for Cercospora althaeina. Furthermore, Cercospora apii s. lat. is identified on 13 host plants including 6 new hosts in the world and 5 new hosts in Iran.
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