Abstract
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 collected. 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, Antidactylariagen. nov. and Isthmomycesgen. nov. and six new species, Antidactylariaminifimbriatasp. nov., Isthmomycesoxysporussp. nov., I.dissimilissp. nov., I.macrosporussp. nov., Triscelophorusanisopterioideussp. nov. and T.sinensissp. 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.
Highlights
The family Microthyriaceae (Microthyriales, Dothideomycetes) was established by Saccardo (1883), containing foliar epiphytes and saprobes on dead leaves and stems (Wu et al 2011a)
Five isolates grouped with Isthmolongispora lanceata CBS 622.66 with good support (MLBP/Bayesian Inference posterior probabilities (BIPP) = 100%/1.0)
We proposed the new genus Isthmomyces to accommodate the three new species, designated as I. dissimilis, I. macrosporus and I. oxysporus and a new combination I. lanceatus
Summary
The family Microthyriaceae (Microthyriales, Dothideomycetes) was established by Saccardo (1883), containing foliar epiphytes and saprobes on dead leaves and stems (Wu et al 2011a). This family is characterised by having superficial, flattened thyriothecia, with cells of the upper wall radiating in a parallel arrangement from the central ostiole opening; the ostiole may or may not be surrounded by setae. 11 genera and about 230 species were listed in this family (Wijayawardene et al 2014), but in a subsequent outline of Ascomycota, only nine genera were accepted (Wijayawardene et al 2018a). Recent studies accepted 11 genera in this family (Hongsanan et al 2020; Wijayawardene et al 2020)
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