File:Galls beside midrib of alder leaf - geograph.org.uk - 957964.jpg

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English: Galls beside midrib of alder leaf. Two kinds of leaf gall were present in abundance on the native 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: 957963.
Date
Source From geograph.org.uk
Author Lairich Rig
Camera location55° 57′ 52″ N, 4° 34′ 40″ W  Heading=90° Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo
Object location55° 57′ 52″ N, 4° 34′ 39″ W  Heading=90° Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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Attribution: Lairich Rig
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current13:21, 22 February 2011Thumbnail for version as of 13:21, 22 February 2011640 × 640 (96 KB)GeographBot (talk | contribs)== {{int:filedesc}} == {{Information |description={{en|1=Galls beside midrib of alder leaf Two kinds of leaf gall were present in abundance on the native alder trees (Alnus glutinosa) in this area; both kinds could often be found on the same tree. Thos

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