Exobasidium vaccinii (Fuckel) Woron. Cowberry Redleaf. Fruit body forming a whitish of pinkish powdery spore-bearing layer on gall-like, thickened, distorted leaves and shoots of members of the Ericaceae. Spores white, elongate, 10–20 x 2.5–5ì, becoming 3-septate at maturity. Habitat leaves and young shoots or flowers of certain members of the Ericaceae; rhododendron, pot-grown azaleas, etc. (shown here on Vaccinium). Season late spring to autumn. Uncommon. Not edible. Found In Europe and probably north America.