Alnus glutinosa, Kekerdom

Alnus glutinosa, Zuid-Limburg ©
Cor Zonneveld: their colour and shine make this unusual galls

the underside is as usual

gall

Small pouches in several vein axils, ± brown, smooth and shiny above, at the underside wide open and set with many white, acute, multicellular hairs.

host plants

Betulaceae, monophagous

Alnus glutinosa, incana & subsp. rugosa, x pubescens.

synonyms

Eriophyes inangulis is not the oldest name of this species. The description and plate of E. axillaris by Connold (1901) certainly does apply to it. This is true also for “Eriophyes alni Fockeu” in Tavares (1905a) but I have not been able to locate Fockeu’s original text.

notes

It is not known whether this species, or alternatively Aceria nalepai, is the causal agent of this conspicuous gall. The other species of this pair probably is just an inquiline.

references

Abras, Fassotte, Chandelier & Cavelier (2008a), Béguinot (2002d,g, 2003a, 2006a,c, 2007b, 2012a), Bellmann (2012a), Buhr (1964b), Chinery (2011a), Coulianos & Holmåsen (1991a), Dauphin & Aniotsbehere (1997a), Deckert & Deckert (2016a), Dietrich (2016a), Farkas (1965a), Fjelddalen (1995a), Groom (2011a), Houard (1908a), Ianovici, Matica & Scurtu (2010a), Jočić & Petanović (2012a), Koops (2013a), Lambinon, Carbonnelle & Claerebout (2015a), Lambinon & Romain (2009a), Lambinon, Schneider & Feitz (2001a), Nalepa (1919a), Petanović & Stanković (1999a), Redfern & Shirley (2011a), Ripka (2007a), Roivainen (1947a, 1951a), Roskam (2009a), Skoracka, Lewandowski & Boczek (2005a), Sylvén (1960a), Tavares (1905a), Vaněčková-Skuhravá (1996a), Weidner (1954a).