Elucidating phylogenetic relationships and genus-level classification within the fungal family Trypetheliaceae (Ascomycota: Dothideomycetes)

While the phylogenetic position of Trypetheliaceae has been the subject of recent molecular studies, the relationships within this family have been little studied. Here we construct a detailed genus-level phylogeny of the family. We confirm previous morphology-based findings suggesting that a substa...

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Published in:Taxon 2014-10, Vol.63 (5), p.974-992
Main Authors: Nelsen, Matthew P., Lücking, Robert, Aptroot, André, Andrew, Carrie J., Cáceres, Marcela, Plata, Eimy Rivas, Gueidan, Cécile, Canêz, Luciana da Silva, Knight, Allison, Ludwig, Lars R., Mercado-Díaz, Joel A., Parnmen, Sittiporn, Lumbsch, H. Thorsten
Format: Article
Language:English
Subjects:
Ascomycota
Ascospores
Biological taxonomies
Crustose
Fungi
Genera
Hyalin
Lichen
Lichens
Ostiole
Phylogenetics
Phylogeny
Systematics
SYSTEMATICS AND PHYLOGENY
Taxa
Taxonomy
Tropical
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Summary:While the phylogenetic position of Trypetheliaceae has been the subject of recent molecular studies, the relationships within this family have been little studied. Here we construct a detailed genus-level phylogeny of the family. We confirm previous morphology-based findings suggesting that a substantial proportion of genera are not monophyletic, and that an overemphasis has been placed on certain character state combinations which do not strictly reflect phylogenetic relationships. Specifically, patterns of ascospore septation, ostiole orientation and type of ascomatal aggregation are evolutionarily labile, and of limited utility for the delimitation of genera as currently circumscribed. We show that species from a number of genera includingAstrothelium, Bathelium, Cryptothelium, LaureraandTrypetheliumtogether form a strongly supported group, referred to here as the“Astrothelium”clade. Species fromAptrootia, Architrypethelium, Campylothelium, Marcelaria (L. purpurinaandL. cumingiigroups),Pseudopyrenulaand species from theTrypethelium eluteriaegroup fall outside of the“Astrothelium”clade and each form monophyletic groups. In contrast, species fromArthopyrenia, MycomicrotheliaandPolymeridiumfall outside of the“Astrothelium”clade, and do not form monophyletic groups. The data presented here validate earlier morphology-based findings suggesting generic delimitations are in need of revision, and provides a first step towards identifying the utility of individual characters and identifying which characters and character state combinations may be useful for future classification.
ISSN:0040-0262
1996-8175
DOI:10.12705/635.9