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Phylogeny of selected aquatic hyphomycetes based on morphological and molecular data

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The phylogenetic relationships of 11 species (pleomorphic as well as holoanamorphic) of aquatic hyphomycetes were analysed. The study comprised seven type species of anamorphic genera. Analyses of sequences of different rDNA regions reinforced the assumption of a polyphyletic origin of aquatic hyphomycetes. On the basis of 18S rDNA data, nine species (Tetracladium marchalianum, Lemonniera terrestris, L. aquatica, Varicosporium elodeae, Tricladium angulatum, T. splendens, Alatospora acuminata, Anguillospora crassa, and A. furtiva) were placed in the Ascomycota class Leotiomycetes. Heliscus lugdunensis and Anguillospora longissima belong to the classes Sordariomycetes and Dothideomycetes, respectively. According to ITS and LSU sequences, T. marchalianum most likely belongs to the Helotiales. ITS sequence data separate two morphotypes of A. acuminata and two clades named the sensu lato and the sensu stricto, respectively. T. splendens showed close relationships with A. crassa and the marine hyphomycete Zalerion varium in ITS analyses, all affiliated to the Helotiales. T. angulatum is also related to the Helotiales but showed closer relation to members of the family Hyaloscyphaceae as revealed from ITS analyses A. longissima is a member of the Pleosporales. According to a recent molecular phylogenetic concept of Lophiostoma and Massarina, A. longissima is close to Lophiostoma.
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Keywords: CLASSICAL TAXONOMY; FRESHWATER FUNGI; INGOLDIAN FUNGI; MOLECULAR PHYLOGENY; RIBOSOMAL RNA; STREAMS

Document Type: Research Article

Publication date: November 1, 2006

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  • Nova Hedwigia is an international journal publishing original, peer-reviewed papers on current issues of taxonomy, morphology, ultrastructure and ecology of all groups of cryptogamic plants, including cyanophytes/cyanobacteria and fungi. The half-tone plates in Nova Hedwigia are known for their high quality, which makes them especially suitable for the reproduction of photomicrographs and scanning and transmission electron micrographs.
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