Phylogenetic diversity of species (Sordariomycetes, Glomerellales, Glomerellaceae) associated with plant diseases in Thailand.

is a cosmopolitan fungal genus, and its species are known for their important role as plant pathogens. They also occur as endophytes and saprobes. The genus comprises species complexes, many of which include cryptic species that are morphologically similar but phylogenetically distinct. is characterized by globose to subglobose ascomata and acervular conidiomata and hyaline, aseptate ascospores and conidia, although a few species produce septate ascospores. Ascospores are typically cylindrical, oval, or fusiform, while conidia are mostly ellipsoidal to ovoid. Many species also produce appressoria, which are formed at the tips of germ tubes or directly from the mycelium. In this study, we collected diseased leaves and pods with spots, blight, and blotches from Chiang Mai, Chiang Rai, and Tak provinces in Thailand. For species identification and delimitation, we employed a biphasic approach incorporating morphological data and multigene phylogenetic analyses of the locus of the internal transcribed spacer (ITS, nuclear rDNA consisting of ITS1-5.8S-ITS2) and the genes encoding for glyceraldehyde-3-phosphate dehydrogenase (), chitin synthase 1 (1), actin (), beta-tubulin 2 (2), histone (3), and calmodulin (). We obtained 20 isolates representing eight species, among which we propose two new species: (from sp.) and (from sp.). We also establish 13 new host records (for six species): (on ), (on sp.), (on , , sp., sp., , and sp.), (on sp., sp., and sp.), (on sp.), and (on sp.). In addition, this is the first study to present the sexual morph of .