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Mycologia, 99(6), 2007, pp. 884-894.
© 2007 by The Mycological Society of America

Tubeufia asiana, the teleomorph of Aquaphila albicans in the Tubeufiaceae, Pleosporales, based on cultural and molecular data


Clement K.M. Tsui 1

     Department of Botany, 3529–6270 University Boulevard, University of British Columbia, Vancouver, BC V6T 1Z4 Canada

Somsak Sivichai

     BIOTEC-Mycology, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Science Park, 113 Paholyothin Road, Klong 1, Klong Luang, Pathumthani 12120, Thailand

Amy Y. Rossman

     Systematic Botany & Mycology Laboratory, Room 304, B011A, 10300 Baltimore, Maryland 20705

Mary L. Berbee

     Department of Botany, 3529–6270 University Boulevard, University of British Columbia, Vancouver, BC V6T 1Z4 Canada

The teleomorph of Aquaphila albicans was discovered on submerged wood collected in Thailand. Its black, soft-textured, setose ascomata, bitunicate asci and hyaline to pale brown, multiseptate ascospores indicated an affinity to Tubeufiaceae (Dothideomycetes). After morphological or molecular comparisons with related species in Tubeufia, Acanthostigma and Taphrophila, it is described and illustrated as a new species, T. asiana Sivichai & K.M. Tsui, sp. nov. Finding this Tubeufia teleomorph was surprising, given the falcate conidia of its A. albicans anamorph, which superficially resemble the conidia of Fusarium and not the coiled, helicosporous conidia of other species in Tubeufiaceae. We assessed the phylogenetic relationships of A. albicans-T. asiana with ribosomal sequences from SSU and ITS and partial LSU regions by parsimony and Bayesian analysis. An initial set of 40 taxa representing a wide range of ascomycete families and their SSU sequences from GenBank showed A. albicans-T. asiana to be nested within the Tubeufiaceae with 100% bootstrap support. Their placement was inferred with ITS and partial LSU ribosomal sequences. The nearly identical ITS sequences of two isolates of A. albicans and one isolate of Tubeufia asiana united these fungi as a monophyletic group with 100% bootstrap support and further nested them, with 88% bootstrap support, in a clade containing Helicoon gigantisporum and Helicoma chlamydosporum. This is the first molecular phylogenetic study to place a nonhelicosporous species within the Tubeufiaceae and to show that helical conidia were lost at least once within the family.

Key words: Acanthostigma, aquatic, freshwater, phylogeny, systematics, Taphrophila, Tubeufia, Tubeufiaceae

1 Corresponding author. E-mail: clementsui{at}gmail.com






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Copyright © 2007 by The Mycological Society of America.