NS3976 : Leaf galls on goat willow

taken 7 years ago, near to Renton, West Dunbartonshire, Great Britain

Leaf galls on goat willow
Leaf galls on goat willow
These galls were found on the same tree as those shown in NS3976 : Leaf galls on goat willow; to avoid needless repetition here, see that item for the context, and for details of the host tree.

The galls shown here were, like those at the last-cited link, produced by a species of sawfly. In this case, the galls are very typical examples of a kind which the standard reference, "British Plant Galls" (Redfern/Shirley/Bloxham; 2002), tentatively identifies as being produced by the species Pontania gallarum.

[The taxonomy of gall-causers on willows was, at the time of submission, still in flux, and the 2011 revision of the above-cited work ascribes this gall, for now, to the species Eupontania pedunculi.]

As the photo shows, the upper side of the galls is semicircular in form, with the midrib forming one side; the gall is raised up on the side furthest from the midrib. On the underside, the galls were globular in form, with several small dark pits visible on each one; since the galls each host a single larva, these were perhaps entrance rather than exit holes (galls are sometimes invaded by predators, but often by so-called inquilines, which enter and make use of galls created by a different species).
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NS3976, 125 images   (more nearby )
Photographer
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Date Taken
Friday, 11 June, 2010   (more nearby)
Submitted
Monday, 21 June, 2010
Geographical Context
Woodland, Forest 
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Life  Closeup 
Near (from Tags)
River Leven 
Category
Galls   (more nearby)
Subject Location
OSGB36: geotagged! NS 3906 7653 [10m precision]
WGS84: 55:57.2852N 4:34.7587W
Camera Location
OSGB36: geotagged! NS 3906 7653
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SOUTH (about 180 degrees)
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Plant Gall 

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