a contribution to the study of erysiphaceae (ascomycota: erysiphales) in iran

in the framework of a study on the powdery mildew fungi in iran, several infected plant specimens were collected from around the country during 2001-2009. based on the results of the study erysiphe quercicola on quercus sp. and e. malvae on malva sp., golovinomyces ambrosiae on helianthus spp., golovinomyces fischeri on senecio glaucus, are the newly reported for iranian mycobiota. in addition, some specimens belonging to golovinomyces cichoracearum s.l. were assessed. according to the new species concept, concerning these taxa, golovinomyces cichoracearum s.s. prevalent in the country was redescribd, and g. sonchicola on sonchus spp. is recorded for the first time, although already reported from iran under the initials of g. cichoracearum s.l.. moreover, some taxa powdery mildew fungi are reported on new hosts in iran as follows: golovinomyces cynoglossii on symphytum asperum, leveillula taurica on daphne mucronata, podosphaera leucotricha on photinia serrutata.