The new lichenicolous genus Ameroconium (dematiaceous hyphomycetes), with its type species A. cladoniae and the new lichenicolous species Phoma psoromatis (pycnidial coelomycetes), are described, discussed and illustrated. Phoma lobariae is recorded for the first time from the Arctic, Russia and Asia on Lobaria linita. Key words: lichen-inhabiting, mitotic fungi, new species, Phoma, taxonomy.