Exobasidium ferrugineae sp. nov., associated with hypertrophied flowers of Lyonia ferruginea in the southeastern USA

Exobasidium ferrugineae, associated with hypertrophied flowers and less commonly leaves of Lyonia ferruginea (rusty staggerbush), is formally described here as a new species. Morphological and DNA sequence (ITS, nLSU) data are provided. Phylogenetic analyses confirm that it is not conspecific with any species of Exobasidium represented by existing DNA sequence data. A key to North American species of Exobasidium on Lyonia is presented.