Hymenium consisting of a thin white layer on hypertrophied flowers having all parts proportionally enlarged, infected flowers up to approx. 6 cm long, or less commonly on leaves that may also be hypertrophied.
”- Kennedy, Aaron H.; Goldberg, Nisse A.; Minnis, Anderw M. : (2012) Exobasidium ferrugineae sp nov, associated with hypertrophied flowers of Lyonia ferruginea in the southeastern USA©