Rust fungi (Uredinales) on <Emphasis Type="Italic">Grewia</Emphasis> species (Tilliaceae) in South Africa,with <Emphasis Type="Italic">Uredopeltis atrides</Emphasis> comb. nov. the new name for <Emphasis Type="Italic">Ravenelia atrides</Emphasis>

The holdings of rust fungi on Grewia species (Tiliaceae) housed in the South African National Collection of Fungi (PREM) were examined. They belong to three morphologically similar, but clearly separable, species of Uredopeltis, and a species of Uredo. Each rust species has a distinct and restricted host range. Ravenelia atrides is a species of Uredopeltis and is transferred accordingly. Several specimens previously accessioned under R. atrides however belong to U. chevalieri. The specimens previously accessioned under Uredo grewiae belong to U. flava, and not U. chevalieri. Three specimens are best placed in Uredo corbiculoides. Taxonomic novelties Uredopeltis atrides (Syd. & P. Syd.) A.R. Wood. comb. nov.