Exobasidium rhododendri (Fuckel) Cramer, 1874
on Rhododendron

Rhododendron hirsutum, Slovenia, Julian Alps, Mangart region, 1800 m © Clemens M Brandstetter

Rhododendron ferrugineum, Austria, Vorarlberg Gaschurn, Silvretta-Stausee, 2000 m © Clemens M Brandstetter

another specimen

a bunch of lesser galls
gall
peach-coloured, globular gall, attached to a leaf; may reach the size of a walnut.
host plants
Ericaceae, narrowly monophagous
Rhododendron ferrugineum, hirsutum, x intermedium.
references
Begerow, Bauer & Oberwinker (2001a), Bellmann (2012a), Blanes-Dalmau, Caballero-López & Pujade-Villar (2017a), Blumer (1946a), Buhr (1965a), Dauphin & Aniotsbehere (1997a), Döring (2003a), Ing (1994a, 2001a), Jage, Kruse, Kummer ao (2013a), Jage, Scholler & Klenke (2010a), Klenke & Scholler (2015a), Kruse (2019a), Llorens i Villagrasa (1984a), Mułenko, Piątek, Wołczańska ao (2010a), Nannfeldt (1981a), Redfern & Shirley (2011a), Roskam (2009a), Schmid-Heckel (1985a), Spooner (1988a), Tomasi (2003a), Woods, Chater, Smith ao (2018a).