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The paper considers 13 species belonging to the genera Diatrype and Cryptosphaeria (Diatrypaceae) found in north-eastern China (Heilongjiang and Jilin Provinces). Cryptosphaeria nigrescens and Diatrype sinensis are described as new species. Four species recorded are only known from the area around the Sea of Japan, three other species display a biogeographical pattern known as ‘Asa Gray disjunction’, and two species are reported far from their main findings in Europe.

Descriptions and illustrations are provided for six diatrypaceous species from Iran. Diatrypella macrospora is introduced as new to science. It differs from all other Diatrypella species by its larger ascospores. New records for the Iranian mycota include Cryptovalsa rabenhorstii, Eutypella citricola, Peroneutypa scoparia and Quaternaria quaternata. Descriptions and illustrations of microscopic characters, ITS sequence data and taxonomic notes are provided for these newly reported taxa.