Iodomarcelleina obscura gen. nov., sp. nov. is described from Malta. This species is morphologically close to Marcelleina Brumm., Korf & Rifai but differs from species of this genus in the size and ornamentation of its ascospores and its amyloid asci, a taxonomic character lacking in species of Marcelleina. Ecologically I. obscura gen. nov., sp. nov. seems to prefer calcareous soils, fruiting in open sunny grounds as well as shaded areas. Genetically, it is nested in the Marcelleina-Ionopezia lineage of Pezizaceae Dumort., but outside of the Marcelleina s.str. clade. Scotopezia pseudoanthracina (Donadini) Van Vooren, Sammut & P.Alvarado, comb. nov., another species not supported within Marcelleina s.str., differs from I. obscura gen. nov., sp. nov. by its smaller and ornamented ascospores, as well as its genetic profile. Finally, the newly obtained data suggest that Marcelleina mediterranea Lantieri & Pfister is a synonym of M. tuberculispora K.Hansen & Sandal. As emended herein, the genus Marcelleina excludes species with amyloid asci.
Mediterranean mycobiota, Pezizaceae, new genera, new species, new combination, new synonym