The article provides information about a rare fungicolous fungus Naohidea sebacea first recorded in Ukraine in Roztochchia Nature Reserve. It was found to parasitize Dothiorella iberica (Botryosphaeriaceae, Botryosphaeriales, Dothideomycetes, Ascomycota). This host is reported for N. sebacea for the first time. Light microscopy, cultural studies, and nucleotide sequence analysis of the ITS-region of the ribosomal DNA were used to identify specimens. The resulting sequences were uploaded to the GenBank database. Based on the analysis of literature sources and personal data, information on morphological features, distribution, and substrate specialization of the fungus is provided.