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Rediscovery of an unusual chytridiaceous fungus new to the order Rhizophydiales

     Dept. of Biological Sciences, The University of Alabama, Tuscaloosa AL 35487

M. Claudia Viusent

     Departamento de Biodiversidad y Biologia Experimental, Universidad de Buenos Aires, C1428EHA Buenos Aires, Argentina

The newest order in Chytridiomycota, Rhizophydiales, shows remarkable genetic divergence and zoospore ultrastructural diversity. From submersed mud from a marsh near an oligotrophic lake in the Patagonia region of Argentina, we isolated a previously undescribed chytrid in Rhizophydiales with unique 28S rRNA and ITS1-5.8S-ITS2 sequences and a distinctive zoospore and thallus. In a combined LSU + 5.8S phylogeny of representative taxa in the order, the nearest relative to this new species is Rhizophlyctis harderi, and their zoospores share several similar character states. A new genus is erected for this chytrid, the first to be brought into pure culture from this region.

Key words: chytrid, ITS rDNA, phylogeny, 28S rDNA, zoospore