title: Rediscovery of an unusual chytridiaceous fungus new to the order Rhizophydiales.
abstract: 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.
authors.affiliation: Dept. of Biological Sciences, The University of Alabama, Tuscaloosa AL 35487, USA. letch006@bama.ua.edu
authors.forename: Peter M
authors.initials: PM
authors.lastname: Letcher
authors.forename: Martha J
authors.initials: MJ
authors.lastname: Powell
authors.forename: M Claudia
authors.initials: MC
authors.lastname: Viusent
mesh_terms: D008411:Chytridiomycota / Q000145:classification* / Q000166:cytology / Q000235:genetics / Q000648:ultrastructure; D004271:DNA, Fungal / Q000235:genetics; D004275:DNA, Ribosomal / Q000235:genetics; D031317:Liquidambar / Q000382:microbiology; D046529:Microscopy, Electron, Transmission; D008969:Molecular Sequence Data; D010802:Phylogeny; D028223:Pinus / Q000382:microbiology; D011058:Pollen / Q000382:microbiology; D012988:Soil Microbiology; D013172:Spores, Fungal / Q000166:cytology / Q000648:ultrastructure
chemical_list: D004271:DNA, Fungal; D004275:DNA, Ribosomal