Diversity of (Cladosporiales, Cladosporiaceae) species in marine environments and report on five new species.

species are cosmopolitan fungi, characterized by olivaceous or dark colonies with coronate conidiogenous loci and conidial hila with a central convex dome surrounded by a raised periclinal rim. species have also been discovered in marine environments. Although many studies have been performed on the application of marine originated species, taxonomic studies on these species are scarce. We isolated species from three under-studied habitats (sediment, seawater, and seaweed) in two districts including an intertidal zone in the Republic of Korea and the open sea in the Western Pacific Ocean. Based on multigenetic marker analyses (for the internal transcribed spacer, actin, and translation elongation factor 1), we identified fourteen species, of which five were found to represent new species. These five species were , , in the species complex, in the species complex, and in the species complex. Morphological characteristics of the new species and aspects of differences with the already known species are described herein together with molecular data.