Abstract
In this study, a new endophyte species within the genus Deniquelata (Didymosphaeriaceae) was isolated from the branches of Persian oak trees (Quercus brantii) in Zagros forests, Iran. The maximum parsimony and Bayesian analyses of 18S, 28S and ITS, rDNA sequence data revealed that the isolates were distinct from other species of the Deniquelata. Based on molecular phylogenetic and morphological characteristics, this fungus was demonstrated to be a new species, Deniquelata quercina. Detailed descriptions and illustrations were provided for D. quercina and it was compared with other known species in the genus.