File:A lichen - Pertusaria amara - geograph.org.uk - 987855.jpg
A_lichen_-_Pertusaria_amara_-_geograph.org.uk_-_987855.jpg (640 × 480 pixels, file size: 131 KB, MIME type: image/jpeg)
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Summary edit
| Description |
English: A lichen - Pertusaria amara The title refers to the white lichen in the upper half of the image (the green lichen to the lower left is a different species of the same genus, Pertusaria pertusa).
Taste is not a test that would normally be applied to lichens, but the species Pertusaria amara is an exception. If a moistened finger is applied to the small white spore-producing discs on its surface (these can be seen in the photo), and then to the tongue, an extremely bitter taste will be experienced after a few seconds. [The species name "amara" comes from a Latin word meaning "bitter" or "pungent". The equivalent Greek word is "pikros": appropriately, then, the chemical causing the bitter taste is called picrolichenic acid.] This lichen was growing on the north-facing side of a tree. |
| Date | |
| Source | From geograph.org.uk |
| Author | Lairich Rig |
| Attribution (required by the license) | Lairich Rig / A lichen - Pertusaria amara / |
| Camera location |   | View this and other nearby images on: OpenStreetMap |  |
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_heading:157.00&language=en){kind=link}
| Object location | | View this and other nearby images on: OpenStreetMap | |
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_heading:157.00&language=en){kind=link}
Licensing edit
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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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 23:00, 22 February 2011 | | 640 × 480 (131 KB) | GeographBot (talk | contribs) | == {{int:filedesc}} == {{Information |description={{en|1=A lichen - Pertusaria amara The title refers to the white lichen in the upper half of the image (the green lichen to the lower left is a different species of the same genus, Pertusaria pertusa). |
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