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The Talaromyces pinophilus species complex.

Stephen W Peterson1, Željko Jurjević2

  • 1National Center for Agricultural Utilization Research, Agricultural Research Service, U. S. Department of Agriculture, 1815 North University Street, Peoria, IL, 61604, USA.

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|September 23, 2019
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Summary

This study reclassifies Talaromyces pinophilus, identifying five new species within its complex and three additional novel species in the Talaromyces sect. Talaromyces. These findings expand the known diversity of Talaromyces fungi.

Keywords:
Fungal systematicsMolecular systematicsMulti locus phylogeny

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Area of Science:

  • Mycology
  • Fungal Taxonomy
  • Molecular Phylogenetics

Background:

  • The Talaromyces pinophilus species complex requires taxonomic clarification.
  • Accurate species delineation is crucial for understanding fungal diversity and ecology.

Purpose of the Study:

  • To resolve the taxonomic status of Talaromyces pinophilus and related species.
  • To describe new species within the Talaromyces genus.

Main Methods:

  • DNA sequencing of four loci for 131 fungal isolates.
  • Phylogenetic analysis using maximum likelihood and GCPSR.
  • Phenotypic characterization through growth studies on standard media.

Main Results:

  • Five new species were segregated from Talaromyces pinophilus, expanding the complex to ten species.
  • Three additional new species (Talaromyces argentinensis, T. californicus, T. louisianensis) were identified in Talaromyces sect. Talaromyces.
  • Talaromyces argentinensis was found to produce a teleomorphic state and is phylogenetically distinct.

Conclusions:

  • The Talaromyces pinophilus species complex is more diverse than previously recognized.
  • The study establishes new species, contributing to the accurate classification of the Talaromyces genus.
  • The discovery of Talaromyces argentinensis highlights unique evolutionary pathways within the section.