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Generic circumscriptions in Geoglossomycetes.

V P Hustad1, A N Miller2, B T M Dentinger3

  • 1Department of Plant Biology, University of Illinois, 505 S. Goodwin Ave., Urbana, IL 61801, USA; ; Illinois Natural History Survey, University of Illinois, 1816 S. Oak St., Champaign, IL 61820, USA.

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Summary
This summary is machine-generated.

A new phylogenetic study of earth tongue fungi (Geoglossomycetes) reveals their taxonomy needs revision. This research proposes two new genera, Glutinoglossum and Sabuloglossum, based on molecular data.

Keywords:
AscomycotaGeoglossumMicroglossumearth tonguesphylogeneticssystematics

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Area of Science:

  • Mycology
  • Fungal Taxonomy
  • Phylogenetics

Background:

  • The class Geoglossomycetes, known as earth tongues, comprises five genera but faces taxonomic challenges due to limited morphological data and difficulties in cultivation.
  • Previous research has been hampered by the lack of clear distinguishing features and ecological information for these fungi.

Purpose of the Study:

  • To investigate the phylogenetic relationships within the Geoglossomycetes using molecular data.
  • To revise the taxonomy of earth tongue fungi based on robust phylogenetic analysis.

Main Methods:

  • Phylogenetic analyses were conducted using maximum likelihood and Bayesian methods.
  • A dataset comprising four genes (ITS, LSU, MCM7, RPB1) was utilized for the analyses.

Main Results:

  • Five well-supported monophyletic clades were identified, which did not align perfectly with existing genera.
  • Two new genera, Glutinoglossum and Sabuloglossum, were proposed to accommodate new and existing species.
  • The genus Thuemenidium was found to be distantly related to Geoglossomycetes, indicating it does not belong in the family Geoglossaceae.

Conclusions:

  • The current generic classification of Geoglossomycetes requires revision based on the new phylogenetic insights.
  • The establishment of Glutinoglossum and Sabuloglossum refines the taxonomic framework for earth tongue fungi.
  • The study clarifies the evolutionary placement of Thuemenidium, excluding it from Geoglossaceae.