Synonyms and other taxonomic changes
Cynips quercusgemmaria Ashmead 1885
Andricus gemmarius Ashmead 1885
Callirhytis gemmaria
Remarks
Causes detachable stem galls on "all the red oaks."
(1)
Typical galls look like this; they secrete honeydew and drop to the ground when mature:
Galls containing "guests" do not drop. They enlarge and become woody, remaining on the tree over the winter. These galls were once described as an Andricus but the type specimens were all Synergus (inquilines). Weld's photo of these "guest"-containing galls looks much like the one below, but an adult Callirhytis emerged from these.
Contributed by
Charley Eiseman on 25 January, 2012 - 10:27am
Additional contributions by
Marci HessLast updated 13 October, 2023 - 12:01pm