Newly recognised lineages of perithecial ascomycetes: the new orders Conioscyphales and Pleurotheciales
2015/10/21 by Martina Réblová, M. Réblová, Keith A. Seifert +5 · 69 citations
Agricultural and Biological Sciences · Biochemistry, Genetics and Molecular Biology · Veterinary · #Biology #Botany #Evolutionary biology #Infectious Diseases and Mycology #Mycotoxins in Agriculture and Food #Plant Pathogens and Fungal Diseases #Zoology
paper · open access · doi:10.3767/003158516x689819
published in Persoonia - Molecular Phylogeny and Evolution of Fungi 37(1), 57-81 (National Herbarium of the Netherlands)
openalex publication_date 2015/10/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Abstract
Phylogenetic analyses of DNA sequences from nuclear ribosomal and protein-coding loci support the placement of several perithecial ascomycetes and dematiaceous hyphomycetes from freshwater and terrestrial environments in two monophyletic clades closely related to the Savoryellales . One clade formed by five species of Conioscypha and a second clade containing several genera of uncertain taxonomic status centred on Pleurothecium , represent two distinct taxonomic groups at the ordinal systematic rank. They are proposed as new orders, the Conioscyphales and Pleurotheciales . Several taxonomic novelties are introduced in the Pleurotheciales , i.e. two new genera ( Adelosphaeria and Melanotrigonum ), three novel species ( A. catenata , M. ovale , Phaeoisaria fasciculata ) and a new combination ( Pleurotheciella uniseptata ). A new combination is proposed for Savoryella limnetica in Ascotaiwania s.str. based on molecular data and culture characters. A strongly supported lineage containing a new genus Plagiascoma , species of Bactrodesmiastrum and Ascotaiwania persoonii , was identified as a sister to the Conioscyphales/Pleurotheciales/Savoryellales clade in our multilocus phylogeny. Together, they are nested in a monophyly in the Hypocreomycetidae , significantly supported by Bayesian inference and Maximum Likelihood analyses. Members of this clade share a few morphological characters, such as the absence of stromatic tissue or clypeus, similar anatomies of the 2-layered ascomatal walls, thin-walled unitunicate asci with a distinct, non-amyloid apical annulus, symmetrical, transversely septate ascospores and holoblastic conidiogenesis. They represent the only fungi in the Hypocreomycetidae with apically free, filiform to cylindrical, persistent or partially disintegrating paraphyses. The systematic placement of two other dematiaceous hyphomycetes was resolved based on DNA sequences; Phragmocephala stemphylioides is a member of the Pleurotheciales and Triadelphia uniseptata is within the Savoryellales .
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