Leaf galls on common alder
Introduction
The photograph on this page of Leaf galls on common alder by Lairich Rig as part of the Geograph project.
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Leaf galls on common alder
Image: © Lairich Rig Taken: 10 Sep 2008
Two kinds of leaf gall were present in abundance on the common alder trees (Alnus glutinosa) in this area; both kinds could often be found on the same tree. Those shown in this photo are caused by the gall mite species Eriophyes inangulis; as the specific part of that name suggests, they grow in the angles between the midrib of the leaf and the side veins. They are about 5 mm long, and, as can be seen, are elongated in the direction of the midrib. On the underside of the leaf, the openings of the galls are quite prominent; they are fringed with brown hairs. The other variety of gall that was present on these trees is shown here: Image
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Image Location
Latitude
55.964404
Longitude
-4.577711