Diversity of (, ) Species Identified in Korean Macroalgae Including Five Unrecorded Species.

(, ) consists of species of terrestrial plant endophytes and pathogens. has also been reported in marine environments such as mangroves, sea fans, and macroalgae. However, limited research has been conducted on associated with macroalgae. Here, we isolated species from three types of algae (brown, green, and red algae) from Korean islands (Chuja, Jeju, and Ulleung) based on phylogenetic analyses of multigenetic markers: the internal transcribed spacers (ITS), beta-tubulin (), and translation elongation factor 1 (). A total of 17 strains were isolated from macroalgae and identified as nine distinct species. The majority of species (seven) were found on brown algae, followed by red algae (three), and then green algae (two). To our understanding, this study represents the first account of , , , , , , and occurring in marine environments. Additionally, this study provides the first report of the occurrence of , , , , and in South Korea. This study will provide valuable insights for future research exploring the functions of fungi in macroalgal communities.