File:Alder tongue gall - geograph.org.uk - 1420944.jpg
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English: Alder tongue gall. This gall, which affects the cone-like female catkins of the alder tree, is caused by a species of fungus, Taphrina alni. The galls start off greenish, but redden as they age. Taphrina amentorum is sometimes encountered as an older synonym for T. alni; for other synonyms, see: http://data.nbn.org.uk/speciesInfo/taxonomy.jsp?spKey=NBNSYS0000020489
According to "British Plant Galls" (Redfern/Shirley/Bloxham), this gall was very rare in Britain in the 1940s, when it was known only from Cornwall. Even in recent years, it was not at all common; however, it now seems to be expanding its range rapidly ( http://data.nbn.org.uk/gridMap/gridMap.jsp?allDs=1&srchSpKey=NBNSYS0000020489 ). See also the first page of the following newsletter: http://www.ibdigital.co.uk/woodland/treelin5.pdf (PDF). The gall shown here is 25mm long, larger than the catkin (15mm high) on which it is growing. This is just one of two locations (both alongside the River Leven) in which, on the day this photo was taken, I happened to notice these galls; about 800 metres upstream, an alder tree was more densely galled, with up to half a dozen "tongues" per catkin: 1420949. Over the next few weeks, I found that it was in evidence in several other locations along the course of the river; in fact, it now appears to be quite common in this area. |
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| Source | From geograph.org.uk |
| Author | Lairich Rig |
| Attribution (required by the license) | Lairich Rig / Alder tongue gall / |
| Camera location |   | View this and other nearby images on: OpenStreetMap |  |
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This image was taken from the Geograph project collection. See this photograph's page on the Geograph website for the photographer's contact details. The copyright on this image is owned by Lairich Rig and is licensed for reuse under the Creative Commons Attribution-ShareAlike 2.0 license.
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This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
Attribution: Lairich Rig
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 18:32, 1 March 2011 | | 640 × 480 (91 KB) | GeographBot (talk | contribs) | == {{int:filedesc}} == {{Information |description={{en|1=Alder tongue gall This gall, which affects the cone-like female catkins of the alder tree, is caused by a species of fungus, Taphrina alni. The galls start off greenish, but redden as they age. Taph |
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