Rhamnus catharticus, Belgium, prov. Namur, Rochefort, Tienne de Boton © Carina Van Steenwinkel

gall

weak, (generally) hypophyllous erineum. The erineum trichomes are slender-fusiform, multicellular, with an obtuse apex.

hostplants

Rhamnaceae, narrowly monophagous

Rhamnus cathartica.

Máca found the gall also on Frangula alnus.

synonyms

Aceria annulata; Eriophyes, Phyllocoptes, annulatus.

references

Béguinot (2006b), Dauphin & Aniotsbehere (1997a), Farkas (1965a), Hellrigl (2003a), Houard (1909a), Lambinon, Carbonnelle & Claerebout (2015a), Ludwig (1974a), Máca (2012a), Redfern & Shirley (2011a), Ripka (2007a), Roivainen (1947a, 1950a), Roskam (2009a), Tomasi (2014a), Weidner (1954a).