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Gall of the week is caused by the gall midge Kiefferia pericarpiicola on several dozen umbellifers, in this case wild carrot, Daucus carota. Photo by Graham Calow.

Gall of the week is cause by the tephritid 'picture-wing fly' Urophora cardui on thistles, Cirsium spp. Male and female fly photos by Malcolm Storey, gall photo unknown.

Gall of the week is caused by the gall midge Rabdophaga rosaria on willows, Salix spp. There is a possibility that these galls are caused by a different species on each species of willow.

Gall of the week is caused by a weevil, Rhinusa antirrhini on the seed pods of common toadflax, Linaria vulgaris. Photographer unknown, image taken from the British Plant Gall Society website: www.britishplantgallsociety.org

Gall of the week is caused by the mite Vasates quadripedes on silver maple, Acer saccharinum. Like its host this originated in North America. First recorded in this country in 2022. Photographer unknown.

Gall of the week, maybe as prominent as last week's robin's pin cushion, is the tassel gall caused by a psyllid, Livia junci, on rushes, Juncus spp. Photo by Tom Higginbottom.

Gall of the week, a distinctive old favourite, is a robin's pin cushion, also called mossy rose gall and bedeguar gall, caused by the cynipid wasp Diplolepis rosae on roses. Photographer unknown.

Gall of the week, an unusual example of what seems to be the mite gall of Aceria pseudoplatanea on sycamore, Acer pseudoplatanus, in Scotland. Photos by Steve Lewis.

Gall of the week, is the oak apple, caused by the cynipid wasp Biorhiza pallida sexual generation. A week late as May 29th was oak apple day, or shick-shack day. It marks the restoration of the Stuart monarchy in 1660, and was a public holiday until 1859. Photographer unknown.

Gall of the week is that of the gall mite Cecidophyopsis betulae on birches, Betulae spp. Photos by Emma Woolley.

Gall of the week is the distinctive one of the sexual generation of the cynipid wasp Andricus grossulariae on Turkey oak, Quercus cerris. Plenty of them about just now. Photographer unknown.

Gall of the week is caused by the fungus Protomyces macrosporus, an ascomycete, on many species of umbellifers, Apiaceae. Photo from BPGS website, photographer unknown.

Gall of the week, something a bit different. This is Chief Gall, right-hand man to Sitting Bull at the Battle of the Little Bighorn, and later a leading spokesman and judge for his people.

Gall of the week, currantly (ahem) hundreds being recorded on iNaturalist and iRecord, is the currant gall caused by the sexual generation of the cynipid wasp Neuroterus quercusbaccarum on oak, Quercus robur, in both of its typical positions. Photos by Tom Higginbottom.

Gall of the week, a bit of a challenge to find, is caused by the sawfly Euura mucronata on sallows, Salix spp. It may be a complex of species according to the host species, so maybe should be E. mucronata agg. Photographer not known, image from the excellent BPGS website.

Gall of the week is the bloodwood apple, found in Australia, caused by scale insects in the genus Cystococcus on bush coconut, Corymbia opaca. Both the gall and the larva inside are 'bush tucker' food apparently. Photographer not known.

Gall of the week, a cynipid wasp gall on roses in Canada. Details in the caption. Photo by Peter Shirley.

Gall of the week, this is a good time to find the rust fungus, Puccinia smyrnii, gall on Alexanders, Smyrnium olusatrum. Photographer unknown.

Gall of the week, one to find on a coastal visit, is caused by the mite Aceria hippophaena on sea buckthorn, Hippophae rhamnoides. Photo by Steve McWilliam.

Gall of the week is caused by a cynipid wasp, either Diplolepis nervosa (spiked pea gall) or D. eglanteriae (smooth pea gall). Without spikes they cannot be separated as D. nervosa can occur without them. They are now recorded on iRecord and iNaturalist as D. eglanteriae agg.

Galls of the week are marble galls of one or more species of cynipid wasp causing marble galls on oaks, Quercus spp. How many can you count with exit holes? Origin of this photo unknown, if you do please let us know.

Gall of the week, well galler, or to be precise cecidologist, of the week is Alfred Kinsey. Before becoming famous for his work on human sexuality in the 1940s, Kinsey was a leading authority on cynipid wasps, with many publications and a collection of over five million of them.

Gall of the week, an unusual one, is caused by a fungus on a fungus. It is Agamothyia wankowiczii on the bracket fungus Ganoderma applanatum. Photo by Graham Calow.

Gall of the week is caused by the cynipid wasp Pediaspis aceris on sycamores, Acer spp. A recent arrival in the UK. Photo by Stephane Claerebout from bladmineerders.nl

Gall of the week is that caused by the gall midge Rabdophaga salicis on willows, Salix spp. Photo by Peter Shirley.

Gall of the week is caused by a recently discovered species new to Britain, the gall wasp Andricus coriarius f. agamic on oak, Quercus robur. Discovered and photographed by Maria Fremlin.

Gall of the week is caused by the cynipid wasp Andricus quercuscorticis f. agamic on oaks, Quercus spp. Photos by Graham Callow.

Gall of the week, with its causer, is that of the tephritid (picture wing) fly Urophora cardui on thistles Cirsium spp. Brilliant photo of the insect by Malcolm Storey, gall photo unknown source.

Gall of the week, with a bonus small copper butterfly, is caused by the midge Dasineura kiefferiana on rosebay willowherb, Chamerion angustifolium. Photo by Mike Poulton.