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Abstract
Ceriospora caudae-suis and Submersisphaeria aquatica, two freshwater pyrenomycetes reported infrequently since their original description, occur commonly on submerged woody debris in the USA. Based on analyses of 28S rDNA sequence data and morphology, both species belong in the Annulatascaceae. Ceriospora caudae-suis is transferred to Pseudoproboscispora, a genus in the Annulatascaceae with similar overall morphology and ecology. Submersisphaeria aquatica is redescribed and illustrated based on additional collections.
Appreciation is expressed to IMI and J. Kohlmeyer for the loan of specimens, to the North Temperate Lakes LTER project, Center for Limnology, University of Wisconsin for permission to collect from LTER lakes, and to the Great Smoky Mountains National Park for permission to collect within the park. Our thanks go to C.W. Hurley, W.L. Hurley, K.M. Robertson, and M.J. Wetzel for assistance with collecting. Financial support of this study by the National Science Foundation (NSF Grant No. DEB 92-00885 and DEB 95-08992) and the National Institutes of Health (NIH Grant No. R01 GM-60600) is gratefully acknowledged.