Leaf spots small, c. 1/2 cm across, rarely more, in heavy attacks often confluent, not or only moderately thickened, at first bright red above with broad yellowish margin, cuticle soon flaking off, especially from the upper surface, which then turns orange brown and slightly glossy as if greasy, eventually sparsely hymenium-clad beneath. Exceptionally, single annual shoots become wholly diseased with leaves dark purple, simulating such diseased by E. uvae-ursi. Leaf-spots and diseased leaves with hyphal palisade between epidermis cells also on upper side.

- Nannfeldt, J.A.: (1981) Exobasidium, a taxonomic reassessment applied to the European species^©