Club Gall Wasp

Callirhytis coortus

Cynipidae

Andricus

Quercus berberidifolia

California

Quercus douglasii

Quercus dumosa

Quercus garryana

Oregon

Washington

British Columbia

New American Cynipids from galls

Andricus coortus (agamic)

Andricus coortus, new species

Gall (pl. 1, fig. 5). — A bud gall in the fall consisting of 1 to 7 elongated, vertical, parallel cells each with a dense, thick, dark-colored wall, the whole forming an elongated or rounded mass projecting above the bud scales, the surface not smooth, covered with short pubescence.

Hosts. — Quercus douglasii and Q. dumosa.

Andricus coortus 

Quercus douglasii, dumosa
Stem galls, woody stem swellings or cells under the bark
Terminal or lateral, abrupt, containing from 2-7 vertical cells, each with a thick, hard, dark wall. The whole pubescent. 

[Undescribed]

Quercus douglasii, dumosa, garryana
Stem galls, woody stem swellings or cells under the bark
Terminal club, not so abrupt. June. Mono. Like clavula in the eastern US.

Cynipid Galls of the Pacific Slope

Andricus coortus
[Page 98]

This cynipid wasp induces integral, polythalamous, round to globular, club-like galls on the tips of new stems of Oregon, blue, and scrub oaks. These galls form in the spring and measure 13mm high by 8mm wide. 

Hosts:
Quercus garryana
Quercus douglasii
Quercus berberidifolia 


Plant Galls of the Western United States

Weld's original description of this species does not match his description in later work or that given by Russo; we follow the latter, which has A coortus as a stem club similar to [Callirhytis clavula](https://www.gallformers.org/gall/847). A coortus apparently differs from C clavula in overwintering in the gall, rather than emerging in the same spring the gall develops on new growth. The dates given in the literature for A coortus could be consistent with a single-generation life cycle, though this would be unusual among cynipids. Based on the genetic and morphological similarity of A coortus with the sexual generation gall of the European species [Andricus inflator](https://bladmineerders.nl/parasites/animalia/arthropoda/insecta/hymenoptera/apocrita/cynipoidea/cynipidae/andricus/andricus-inflator/), it seems reasonable to imagine that A coortus would have an agamic generation gall similar to the fall bud gall of that species.[Andricus verensis](https://www.gallformers.org/gall/2418) closely matches that description morphologically but seems to differ in phenology, as a spring gall.

Gallformers ID Notes