Gall ID please

[Tiggrx]

Having a bit of trouble IDing this gall. It was growing on underside of Sallow (Salix cinerea) leaves in a chalk pit in Bucks. There never seemed to be more than one gall per leaf.

Any help appreciated
Thanks
Aaron

[Hobjob]

Originally Posted by Tiggrx

Having a bit of trouble IDing this gall. It was growing on underside of Sallow (Salix cinerea) leaves in a chalk pit in Bucks. There never seemed to be more than one gall per leaf.

Any help appreciated
Thanks
Aaron

My nearly untouched recently bought copy of "British Plant Galls"
Redfern, Shirley & Bloxham from the FSC does not suggest
a definitive answer. But then I had not realised the complexity
of galls till I bought the book

Best guess would be Pontania viminalis but its not meant to grow on s. cinerea

Pontania viminalis

If you don't have that book I'll happily pm the relevant pages, though
they are b&w line drawings not photos.

[Dogghound]

A complex subject with such a diversity of galls. The gall in the photo looks alot like that of Diplolepis eglanteriae, most of these small unilocular galls drop from the leaf onto the leaf litter where emergence occurs in spring.

[Paul mabbott]

I've not seen this. Bioimages - Pontania proxima (Lepeletier) (a sawfly) - quotes Stubbs (2002) as 'willows' generally.

Originally Posted by Hobjob

My nearly untouched recently bought copy of "British Plant Galls"
Redfern, Shirley & Bloxham from the FSC does not suggest
a definitive answer. But then I had not realised the complexity
of galls till I bought the book

Best guess would be Pontania viminalis but its not meant to grow on s. cinerea

Pontania viminalis

If you don't have that book I'll happily pm the relevant pages, though
they are b&w line drawings not photos.

[Tiggrx]

Thanks for the input guys.

I do have the "British Plant Galls" book and had come to a bit of a dead end. I was kind of leaning towards a Pontania sp. but nothing seemed to quite fit

[Paul mabbott]

Perhaps it's a 'new' one for Britain? Seems uulikely but these things do happen - it would certainly be worth sending photos/specimens to an expert in the field.

Originally Posted by Tiggrx

Thanks for the input guys.

I do have the "British Plant Galls" book and had come to a bit of a dead end. I was kind of leaning towards a Pontania sp. but nothing seemed to quite fit

[thunder]

Why not Pontania tuberculata?

henrya

[Tiggrx]

Originally Posted by thunder

Why not Pontania tuberculata?

henrya

certainly a possibility - but having looked at the Gall Book again I would interested to know what "caterpillar grey" is

[RobSutton]

Originally Posted by thunder

Why not Pontania tuberculata?

henrya

I came to the same conclusion following the FSC Plant Gall Key.

[RobSutton]

Originally Posted by Tiggrx

certainly a possibility - but having looked at the Gall Book again I would interested to know what "caterpillar grey" is

I took it as meaning the "caterpillar" is grey ie the thing inside rather than it being the colour of the gall.