[I]nfecting major branch-complexes or entire stems but, as it seems, never passing through subterranean parts from one stem to another. Branching only little influenced. Leaves mostly slightly diminished, pale green to (in strong light?) often reddish, often mottled above and eventually hymenium-clad and chalk-white between the well-marked naked nerves beneath.[At times] leaves somewhat enlarged ...

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