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Exophiala crusticola anam. nov. (affinity Herpotrichiellaceae), a novel black yeast from biological soil crusts in the Western United States

Scott T. Bates, Gundlapally S. N. Reddy and Ferran Garcia-Pichel

School of Life Sciences, Arizona State University, Main Campus, Tempe, AZ-85287-4501, USA

Correspondence
Ferran Garcia-Pichel
ferran{at}asu.edu

A novel black yeast-like fungus, Exophiala crusticola, is described based on two closely related isolates from biological soil crust (BSC) samples collected on the Colorado Plateau (Utah) and in the Great Basin desert (Oregon), USA. Their morphology places them in the anamorphic genus Exophiala, having affinities to the family Herpotrichiellaceae (Ascomycota). Phylogenetic analysis of their D1/D2 large subunit nuclear ribosomal RNA (LSU nrRNA) gene sequences suggests that they represent a distinct species. The closest known putative relative to Exophiala crusticola is Capronia coronata Samuels, isolated from decorticated wood in Westland County, New Zealand. The holotype for Exophiala crusticola anam. nov. is UAMH 10686 and the type strain is CP141b^T (=ATCC MYA-3639^T=CBS 119970^T=DSM 16793^T). Dark-pigmented fungi appear to constitute an important heterotrophic component of soil crusts and Exophiala crusticola represents the first description of a dematiaceous fungus isolated from BSCs.

The GenBank/EMBL/DDBJ accession numbers for the D1/D2 large subunit nuclear ribosomal RNA gene sequences of strains CP141b^T and OR302-3 are AM048755 and DQ777875, respectively. The accession number for the sequence of the internal transcribed spacer of the nuclear ribosomal RNA gene for strain CP141b^T is AM048756.

Comparisons of the nucleotide sequences of the D1/D2 large subunit nuclear ribosomal RNA gene of Exophiala crusticola and related taxa, details of the characteristics that distinguish strains CP141b^T and OR302-3 and an additional phylogenetic tree are available as supplementary material in IJSEM Online.

These authors contributed equally to this work.

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