Abstract
Microfungi associated with woody plants on the Qinghai–Tibet Plateau (QTP) were investigated, and four collections associated with Potentilla fruticosa were obtained from Gansu and Qinghai provinces in China. Morphologically, they line well with Lentitheciaceae in having subglobose to globose ascomata with brown setae on the papilla but can be distinguished from other genera by its superficial, globose, black, thick-walled ascomata, and fusiform, hyaline (rarely pale brown), one-septate ascospores, surrounded by an entire mucilaginous sheath. The phylogenetic analyses based on a combined SSU, ITS, LSU and TEF1-α sequence data showed that four isolates formed a monophyletic clade among the genera of Lentitheciaceae, and present as a distinct lineage (sister clade to Darksidea). Therefore, we introduce a new genus Crassoascoma, with C. potentillae as the type to accommodate these taxa. Detailed description and illustration are provided, and the establishment of new taxa is justified with morphology and phylogenetic evidence.
Highlights
Academic Editor: Michael WinkDothideomycetes is the largest class of the phylum Ascomycota, comprising 38 orders and 210 families [1,2]
This study investigated microfungi associated with decayed woody plants on the Qinghai–Tibet Plateau (QTP)
The final dataset comprised of 67 taxa selected from Bambusicolaceae, Didymosphaeriaceae, Lentitheciaceae, Massarinaceae and Sulcatisporaceae in the suborder Massarineae (Pleosporales, Dothideomycetes), with Helminthosporium velutinum (MAFF 243854) and Massarina eburnean (CBS 473.64) as outgroup taxa
Summary
Dothideomycetes is the largest class of the phylum Ascomycota, comprising 38 orders and 210 families (including the incertae sedis) [1,2]. The morphology of this class is diverse and usually have bitunicate asci in their sexual morphs. Pleosporales is the largest order in Dothideomycetes, which includes approximately 91 families and 606 genera With the continuous addition of new members, the family currently comprises fourteen genera: Darksidea [9], Halobyssothecium [10], Katumotoa [11], Keissleriella [12], Lentithecium [8], Murilentithecium [13], Neoophiosphaerella [14], Phragmocamarosporium [15], Pleurophoma [16], Poaceascoma [17], Pseudomurilentithecium [18], Setoseptoria [19], Tingoldiago [20] and Towyspora [21]. Members of Lentitheciaceae are characterized by lenticular to globose ascomata with brown setae or glabrous, cylindrical to clavate asci with short pedicels, and morphologically diverse ascospores, mostly narrow to broad fusiform, hyaline to brown, 1–3-septate
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