File:A lichen - Physcia caesia - geograph.org.uk - 1068085.jpg
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English: A lichen - Physcia caesia "It is common on nutrient-enriched, well-lit calcareous materials, but may also be found on acid rocks on the coast. The centre of the thallus and the long lobes have pale, blue-flecked soralia" [George Baron, in "Understanding Lichens"]. The thallus is the main body of the lichen, and the term "soralia" is explained below.
This specimen was growing on a boulder on the upper part of the beach. The soralia are the darker small round structures scattered over most of the lichen's surface, except for its edges; they allow the lichen to reproduce asexually. They are masses of soredia, which are loose powdery granules containing a few fungal and algal cells (i.e. both of the components that make up the lichen). When dispersed, soredia can develop into new lichens. For images of other Physcia species, see the links at the end of 1050283. |
| Date | |
| Source | From geograph.org.uk |
| Author | Lairich Rig |
| Attribution (required by the license) | Lairich Rig / A lichen - Physcia caesia / |
| Camera location |   | View this and other nearby images on: OpenStreetMap |  |
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| Object 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 | 03:17, 24 February 2011 | | 640 × 480 (151 KB) | GeographBot (talk | contribs) | == {{int:filedesc}} == {{Information |description={{en|1=A lichen - Physcia caesia "It is common on nutrient-enriched, well-lit calcareous materials, but may also be found on acid rocks on the coast. The centre of the thallus and the long lobes have pale, |
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