Exobasidium ferrugineae

Exobasidium fawcettii

Exobasidium peckii

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. 

[S]imilar to E. ferrugineae as it infects both flowers and leaves, but ... distinguished by ... a lesser amount of hypertrophy on flowers ... [which are] up to approx. 2 × longer [than uninfected flowers]

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