File:A lichen - Xanthoparmelia conspersa - geograph.org.uk - 945680.jpg
A_lichen_-_Xanthoparmelia_conspersa_-_geograph.org.uk_-_945680.jpg (640 × 480 pixels, file size: 142 KB, MIME type: image/jpeg)
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English: A lichen - Xanthoparmelia conspersa (Synonym: Parmelia conspersa)
This lichen was growing on boulders that are the remains of an ancient hill fort on Carman Hill; see: 697526. This lichen has a bright green colour (from the presence of the compound usnic acid in its outer layer). It has well-defined lobes at the edges, but the middle of the lichen is arranged in diffuse heaps. Closer inspection of these through a hand-lens reveals that they are masses of little rod-like structures that are branched like coral. These are called isidia, and are reproductive structures; they contain fungal and algal cells (the two components that make up a lichen), and, when broken off and dispersed, can develop into new lichens. The presence of this lichen reveals several facts about its location; this species grows on acid rocks, needs full exposure to sunlight, and also requires organic nitrogen [see e.g. Chapter 5 of "Understanding Lichens" by George Baron]. The boulders on which it is growing are set on a south-facing slope near the summit of the hill, and so receive full sunlight; the nitrogenous nutrients that the lichen needs are left behind by birds which perch on these rocks. |
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| Source | From geograph.org.uk |
| Author | Lairich Rig |
| Attribution (required by the license) | Lairich Rig / A lichen - Xanthoparmelia conspersa / |
| 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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 09:05, 22 February 2011 | | 640 × 480 (142 KB) | GeographBot (talk | contribs) | == {{int:filedesc}} == {{Information |description={{en|1=A lichen - Xanthoparmelia conspersa (Synonym: Parmelia conspersa) This lichen was growing on boulders that are the remains of an ancient hill fort on Carman Hill; see: 697526. This lichen |
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