Globosus polychromus gen. et sp. nov. for a freshwater hyphomycete in Muyocopronaceae (Muyocopronales)

Abstract A new genus Globosus with a new species G. polychromus is introduced from a freshwater habitat in Thailand, based on morphological characters with evidence from phylogenetic analysis of concatenated internal transcribed spacer region ITS4-5.8S -ITS5 (ITS), nuclear large subunit rDNA (28S) and nuclear small subunit rDNA (18S) sequence data. Phylogenetically, Globosus clustered with Quadrisporellaand Setoapiospora in Muyocopronaceae with 100% ML/ 1.00 BYPP support. However, there are differences in morphology. Globosus is characterized by its hyphomycetous structure and having pink or yellow colonies in culture on the natural substrate and PDA, its conidiogenous cells exhibit distinctive globular intumescence which differs from existing genera in Muyocopronaceae. Descriptions and illustrations of G. polychromus are provided with a key to asexual genera in Muyocopronaceae.