First Record of the Genus Exarmidium (Odontotremataceae, Ascomycota) from Bulgaria

Abstract

This article presents the first record of Exarmidium hemisphaericum in Bulgaria. The genus is also reported for the first time from the country. The observed colour reaction of the excipulum to nitric acid is documented here for the first time. Detailed descriptions of the morphological structures and colour reactions are provided. A lichen-like interaction between the fungus and a green alga is described. Additional comments on the systematic position of the genus within the fungal systematics are included.