[1] Exobasidium parvifolii is a basidiomycete fungi in order Exobasidiales.

It forms a systemic, perennial polycarpic infection of at least two species of Vaccinium; V. parvifolium and V. ovalifolium.

E. parvifolii stimulates hosts to from cladomania, diseased accessory shoots, annually.

Exobasidium parvifolii grows in wet, hypermaritime forested ecosystems where their Vaccinium hosts flourish.

Exobasidium parvifolii translates to "exorbitant inflection" in Latin.