Quercus robur, België, prov. Luik, Villers-l’Evêque © Jean-Yves Baugnée

gall

The gall resembles the one of A. callidoma, but stands on a much shorter stalk, and also the apical projection is less pronounced; slightly pilose. Galls in September-October.

hostplants

Fagaceae, monophagous

Quercus faginea, lusitanica, petraea, pyrenaica, robur.

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on Quercus, sexual generation

Quercus robur, catkin with galls and an individual gall (uit Houard, 1908a)

gall

Gall in a male catkin, but not consisting of a galled stamen, rather derived from the flower base (Buhr). It is oval with an acute tip, c. 1.5 mm long, green at first, eventually brown. The gall is smooth, not ribbed, without hairs, except for a small tuft at the tip that may be present. Gall often surrounded by unmodified stamens.
Buhr, Redfern, and Melika describe the gall as warty; that is in disagreement with Adler’s own description or the one by Houard. Galls are mature end May.

hostplants

Fagaceae, monophagous

Quercus faginea, petraea, pyrenaica, robur.

synonyms

Andricus nudus Adler, 1881

inquilines

Synergus gallaepomiformis.

references

Adler (1881a), Bellmann (2012a), Buhr (1965a), Cerasa (2015a), Chinery (2011a), Cogolludo (1921a), Dauphin & Aniotsbehere (1997a), Eady & Quinlan (1963a), Hellrigl (2009a, 2012a), Hellrigl & Bodur (2015a), Houard (1908a), Katılmış & Kıyak (2008a), Kemal & Koçak (2010a), Koops (2013a), Kwast (2014a), Lambinon, Carbonnelle & Claerebout (2015a), Melika (2006a), Melika, Csóka & Pujade-Villar (2000a), Nieves-Aldrey (1983a, 2001a), Nieves-Aldrey, Gómez, Hernández Nieves & & Lobo (2006a), Pujade-Villar & Melika (2000a), Redfern & Shirley (2011a), Roskam (2009a), Tomasi (2014a), Wiebes-Rijks (1976a), Williams (2010a).