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The systematic position of Phaeocryptopus gaeumannii.

Loretta M Winton¹, Jeffrey K Stone, Everett M Hansen

¹Department of Botany & Plant Pathology, Oregon State University, Corvallis, Oregon 97330, USA. lori.winton@uaf.edu

|August 9, 2007

Summary

Phylogenetic analysis reveals Phaeocryptopus gaeumannii, the cause of Swiss needle cast, is not closely related to other species in its genus or family. This finding reclassifies P. gaeumannii and challenges current fungal taxonomy.

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Area of Science:

Mycology
Plant Pathology
Molecular Systematics

Background:

Phaeocryptopus gaeumannii causes Swiss needle cast, a significant Douglas-fir disease.
Current taxonomy places Phaeocryptopus within Venturiaceae (Pleosporales), a family with hyphomycetous anamorphs.
The anamorph-teleomorph connection between Rhizosphaera and Phaeocryptopus is not definitively established.

Purpose of the Study:

To confirm the phylogenetic relationships of Phaeocryptopus species using nuclear ribosomal gene sequences.
To investigate the taxonomic placement of Phaeocryptopus and the family Venturiaceae.
To clarify the anamorph-teleomorph relationship between Rhizosphaera and Phaeocryptopus.

Main Methods:

Phylogenetic analyses using small (SSU) and large (LSU) subunits and internal transcribed spacer (ITS) regions of nuclear ribosomal gene sequences (nrDNA).
Comparison of sequence data to confirm fungal relationships and taxonomic classifications.

Main Results:

Phylogenetic analyses indicate that both the genus Phaeocryptopus and the family Venturiaceae are unnatural groups.
Phaeocryptopus nudus is aligned in Dothioraceae (Dothideales), while P. gaeumannii is placed in Mycosphaerellaceae (Capnodiales).
Rhizosphaera species are closely related to P. nudus, supporting an anamorph-teleomorph link, but not to P. gaeumannii.

Conclusions:

The current classification of Phaeocryptopus and Venturiaceae requires revision.
Phaeocryptopus gaeumannii is not congeneric with P. nudus, necessitating a reevaluation of the genus Phaeocryptopus.
The study provides molecular evidence for the anamorph-teleomorph connection between Rhizosphaera and P. nudus, but not P. gaeumannii.