Two new asexual genera and six new asexual species in the family Microthyriaceae (Dothideomycetes, Ascomycota) from China

The family Microthyriaceae is represented by relatively few mycelial cultures and DNA sequences; as a result, the taxonomy and classification of this group of organisms remain poorly understood. During the investigation of the diversity of aquatic hyphomycetes from southern China, several isolates were col-lected. These isolates were cultured and sequenced and a BLAST search of its LSU sequences against data in GenBank revealed that the closest related taxa are in the genus Microthyrium. Phylogenetic analyses, based on the combined sequence data from the internal transcribed spacers (ITS) and the large subunit (LSU), revealed that these isolates represent eight new taxa in Microthyriaceae, including two new genera, Antidactylaria gen. nov. and Isthmomyces gen. nov. and six new species, Antidactylaria minifimbriata sp. nov., Isthmomyces oxysporus sp. nov., I. dissimilis sp. nov., I. macrosporus sp. nov., Triscelophorus anisopteri-oideussp. nov. and T. sinensis sp. nov. These new taxa are described, illustrated for their morphologies and compared with similar taxa. In addition, two new combinations are proposed in this family.

Automated summary

The family Microthyriaceae is poorly understood due to limited mycelial cultures and DNA sequences. Through study of aquatic hyphomycetes in southern China, eight new taxa were discovered within Microthyriaceae, including two new genera and six new species. These new taxa were described, illustrated, and compared with similar taxa.