New species and new records of aquatic asexual ascomycetes from estuarine beaches of the Brazilian Amazon

Estuaries are habitats characterised by high biological productivity; however, fungal biodiversity in these ecosystems remains understudied. During an investigation of asexual ascomycetes associated with decaying twigs in the intertidal zone of fluvial beaches on Mosqueiro Island, Pará, Brazil, three new species have been proposed based on their morphological characteristics. These new species are Bactrodesmium amazonicum sp. nov., Craspedodydymum brasiliense sp. nov., and Cancellidium estuarinum sp. nov. Additionally, new records of Cumulospora marina for the Americas and Virgariella caribensis, the second recorded instance in the world, have been reported. The results include descriptions, taxonomic comments, geographic distribution, and illustrations, all contributing to the knowledge of estuarine fungal diversity.