摘要：Two species of Diatrypaceae (Xylariales) are described and illustrate from Iran. Diatrypella iranensis from dead branches of Quercus brantii is described as a new species based on both morphology and molecular sequence data. It differs from other members of the genus on the basis of stroma morphology and ascus and ascospore sizes. Molecular data of the ITS rDNA region show that the new species is a sister taxon of Diatrypella quercina . Cryptovalsa ampelina is described from dead branches of Juglans regia and is a new record from Iran. This study is the first in a series that investigate the diversity of Diatrypaceae from Iran
