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Abstract
Two pyrenomycetes in the Annulatascaceae described from freshwater, Annulatascus triseptatus and Ascolacicola austriaca, are reported from North and South America for the first time. Both species occur commonly on submerged wood in the U.S.A. The two taxa are similar morphologically in having black coriaceous ascomata, cylindrical necks, septate paraphyses, cylindrical pedicellate asci with prominent apical rings and three-septate ascospores. Molecular data demonstrates that Annulatascus is polyphyletic, with A. triseptatus on a clade widely separated from the type species of the genus, A. velatisporus. Ascolacicola austriaca is on a monophyletic clade within the Annulatascaceae as sister taxon of A. triseptatus. Based on morphological data and phylogenetic analyses of 28S rDNA sequence data, new genera Annulusmagnus and Ascitendus are established for Annulatascus triseptatus and Ascolacicola austriaca, respectively.
We would like to thank J.L. Crane, P.M. Fallah, C.W. Hurley, J. Anderson, C. Brown, W.L. Hurley, K. Langdon, G. Laursen, M.A. Morgan, F. Ortega, K.M. Robertson, J.D. Schoknecht, D.C. Taphorn, M.J. Wetzel and R. Wulffen for assistance with collecting. Our thanks also go to H. Raja for provision of cultures and C. Brown for assistance with isolate measurements. Appreciation is expressed to The University of Hong Kong (HKU) and the National Museum, Praha, Czech Republic, (PRM) for loan of herbarium material. This work was supported in part by National Computational Science Alliance under DEB030013 and used the IA-64 Linux Cluster and IBM pSeries 690. Financial support by the National Science Foundation (NSF Grant No. DEB 92-00885, DEB 95-08992 and DEB 99-71645) and the National Institutes of Health (NIH Grant No. R01 GM-60600) is gratefully acknowledged.