sp. nov. and an updated key to the species of (Myriangiaceae, Dothideomycetes).

Background: belongs to Dothideomycetes and its members are epiphytic on living bamboo culms or palms and distributed in tropical regions. Currently, the genus comprises seven species. Another collection resembling was collected from the leaves of sp. in Thailand. Morphological characteristics and multilocus phylogenetic analyses, using ITS, LSU and SSU sequences, showed that the fungus is new to science, described herein as . is characterised by apothecial ascostromata, a carbonised epithecium, dark brown setae on the ascostromatal surface, hyaline paraphysoids, ovoid to clavate asci and oblong to elliptical, muriform ascospores. The fungus has a dark pigmented surface and is occasionally facultatively associated with patches of green algae, but not actually lichenised. Instead, the fungus penetrates the upper leaf surface, forming dark pigmented isodiametric cells below the epidermis.

New Information: Re-examination of specimens of , and revealed the absence of algal associations. The status of (= ) and (= ) was established, based on morphological comparisons and previous studies. Comprehensive morphological descriptions with phylogenetic analyses support as a novel species in . An updated key to the known species of the genus is also provided.