NS3976 : Leaf galls on goat willow

taken 8 years ago, near to Renton, West Dunbartonshire, Great Britain

Leaf galls on goat willow
Leaf galls on goat willow
The tree on which these galls were found stands on the eastern side of the section of cycle route that is shown in NS3976 : Cycle Route 7 at Mains of Cardross.

The tree is a goat willow, Salix caprea, which is also sometimes referred to as great sallow or pussy willow, and the hard galls are caused by a species of sawfly, Pontania bridgmanii(*). This kind of gall is said to be widespread and common.

[(*) This identification was based on the keys in the handbook "British Plant Galls" (2002). The taxonomy of gall-causers on willows was, at the time of submission, still in flux, but the 2011 revision of that book likewise identifies the gall as being caused by Pontania bridgmanii.]

The photograph also happens to include two examples of another kind of gall, visible above and just below the leaf that is being discussed here; that kind of gall is illustrated and discussed separately in NS3976 : Leaf galls on goat willow.

Compare another kind of Pontania gall that occurs in the same area, but on Salix fragilis: NS3976 : Leaf galls on crack willow. (Gall-causers are often very host-specific; to identify the kind of gall, it is therefore necessary to identify the species of the host plant.)
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NS3976, 132 images   (more nearby )
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Date Taken
Friday, 4 June, 2010   (more nearby)
Monday, 21 June, 2010
Geographical Context
Woodland, Forest 
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Closeup  Life 
Near (from Tags)
River Leven 
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
View Direction
South-southeast (about 157 degrees)
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Plant Gall 

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