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Postia caesia complex (Polyporales, Basidiomycota) in temperate Northern Hemisphere
O Miettinen1, J Vlasák2, B Rivoire3
1Finnish Museum of Natural History, University of Helsinki, Finland.
Fungal Systematics and Evolution
|June 4, 2020
Summary
The taxonomy of the Postia caesia complex has been revised, recognizing 24 species based on morphology and genetic data. This study re-establishes the identity of Postia caesia and describes 10 new species.
Area of Science:
- Mycology
- Taxonomy
- Molecular Systematics
Background:
- The Postia caesia complex is a group of fungi with complex taxonomy.
- Previous classifications may not fully reflect the species diversity within this complex.
Purpose of the Study:
- To revise the taxonomy of the Postia caesia complex.
- To clarify species boundaries using morphological and molecular data.
- To describe new species and provide updated taxonomic treatments.
Main Methods:
- Morphological analysis of fungal specimens.
- DNA sequencing of two genetic markers: internal transcribed spacer (ITS) and translation elongation factor 1-alpha (tef1).
- Phylogenetic analyses to infer species relationships.
Main Results:
- Recognition of 24 distinct species within the Postia caesia complex, significantly expanding known diversity.
- Re-establishment of the identity of the core species, Postia caesia, with neotype designation.
- Description of 10 new species: P. arbuti, P. auricoma, P. bifaria, P. comata, P. cyanescens, P. glauca, P. livens, P. magna, P. populi, and P. yanae.
- Proposal of four new combinations.
- Detailed descriptions provided for 20 temperate Northern Hemisphere taxa.
Conclusions:
- The Postia caesia complex is far more diverse than previously understood.
- Morphological and molecular data are crucial for resolving taxonomic uncertainties in fungi.
- This revision provides a foundation for future research on the ecology and evolution of this fungal group.
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