Diagnostics for a troubled backbone: testing topological hypotheses of trapelioid lichenized fungi in a large-scale phylogeny of Ostropomycetidae (Lecanoromycetes)

Fungal Diversity
Philipp ReslToby Spribille

Abstract

Trapelioid fungi constitute a widespread group of mostly crust-forming lichen mycobionts that are key to understanding the early evolutionary splits in the Ostropomycetidae, the second-most species-rich subclass of lichenized Ascomycota. The uncertain phylogenetic resolution of the approximately 170 species referred to this group contributes to a poorly resolved backbone for the entire subclass. Based on a data set including 657 newly generated sequences from four ribosomal and four protein-coding gene loci, we tested a series of a priori and new evolutionary hypotheses regarding the relationships of trapelioid clades within Ostropomycetidae. We found strong support for a monophyletic group of nine core trapelioid genera but no statistical support to reject the long-standing hypothesis that trapelioid genera are sister to Baeomycetaceae or Hymeneliaceae. However, we can reject a sister group relationship to Ostropales with high confidence. Our data also shed light on several long-standing questions, recovering Anamylopsoraceae nested within Baeomycetaceae, elucidating two major monophyletic groups within trapelioids (recognized here as Trapeliaceae and Xylographaceae), and rejecting the monophyly of the genus Rimularia. We tran...Continue Reading

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Citations

Jul 16, 2016·Molecular Ecology·Christoph Scheidegger
Oct 20, 2018·Proceedings. Biological Sciences·Philipp ReslToby Spribille
Aug 14, 2020·The Lichenologist·Toby SpribilleLewis Sharman
Jan 15, 2017·Microbiology Spectrum·Martin Grube, Mats Wedin

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Methods Mentioned

BETA
PCR

Software Mentioned

phylo
Tracer
SeqGen
py
Python
SOWHAT
MrBayes
compat
R Development Core Team
AWTY

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