Abstract A description is provided for Puccinia cladii found parasitic on leaves of Cladium mariscus . Some information on its taxonomy, morphology, associated organisms, habitats, dispersal and transmission and conservation status are given, along with details of its geographical distribution (Republic of Georgia, Bermuda, American Virgin Islands, Dominican Republic, Puerto Rico, Guatemala, Belgium, Bulgaria, Netherlands, Poland, UK and USA (Arizona, California, Florida, Mississippi, North Carolina, Virginia)) and hosts ( Cladium mariscus, C. mariscus subsp. californicum, C. mariscus subsp. jamaicense and Rhynchospora glomerata ).