Andricus quercuscalicis (Burgsdorf, 1783)
on Quercus, agamous generation
Quercus robur, Belgium, prov. Namur, Hour © Jean-Yves Baugnée
Quercus robur, Zeewolde, Harderbos © Hans Jonkman: young galls, mid July
same gall from above
Quercus robur, Biddinghuizen, Spijkbos © Hans Jonkman: young gall
Quercus robur, Zeewolde, Harderbos © Hans Jonkman: the gall starts to overgrow the acorn
here the acorn is completely engulfed
the gall develops from the inside of the cupula. Young gall can easily be mistaken for Andricus grossularia. in cross section however that is a multilocular galling of the acorn itself. The development of the knopper gall is a completely different one.
Quercus x haynaldiana, petraea, pubescens, robur.
on Quercus, sexual generation
Quercus cerris, gall (from Houard, 1908a)
Quercus cerris, Dronten © Arnold Grosscurt. (The large galls are of Andricus grossulariae.)
Fagaceae, narrowly monophagous
Quercus cerris, suber.
Ovoid gall, 2.5 mm high, derived from one, strongly enlarged locule; remnants of the other locule are visible at the side of the gall.
Cynips quercuscalicis; C. calicis Hartig, 1843, Andricus beyerincki / beijerincki Trotter, 1899; A. cerri Beijerinck, 1885.
The species is found also in regions where Quercus cerris does not naturally occur; it even seems to be on the increase there. It is not clear whether the sexual generation is only facultative, and thus may be skipped, or that the relatively few artificially planted cerris trees are sufficient to maintain the population. See Kofler & Zwander (2009a) and other on this question.
Béguinot (2006c), Bellmann (2012a), Blanes-Dalmau, Caballero-López & Pujade-Villar (2017a), Buhr (1965a), Cerasa (2015a), Chinery (2011a), Cogolludo (1921a), Dauphin & Aniotsbehere (1997a), Ellis (2005a), Groom (2011a), Hellrigl (2009a, 2010a) Hellrigl & Bodur (2015a), Houard (1908a), Katılmış & Kıyak (2008a), Kemal & Koçak (2010a), Kofler & Zwander (2009a), Kollár (2007a, 2011a), Koops (2013a), Kwast (2012a, 2014a), Lambinon, Carbonnelle & Claerebout (2015a), Lambinon Schneider & Feitz (2012a), Lehmann & Hannover (2016a), Marković (2014a), Melika (2006a), Melika, Csóka & Pujade-Villar (2000a), Pellizzari (2010a), Redfern & Shirley (2011a), Roques, Cleary, Matsiakh & Eschem (2017a), Roskam (2009a), Schneider (2016a), Tomasi (2014a), Williams (2010a).