File:A lichen - Tephromela atra ("Black Shields") - geograph.org.uk - 1057655.jpg
A_lichen_-_Tephromela_atra_("Black_Shields")_-_geograph.org.uk_-_1057655.jpg (640 × 480 pixels, file size: 145 KB, MIME type: image/jpeg)
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Summary
[edit]DescriptionA lichen - Tephromela atra ("Black Shields") - geograph.org.uk - 1057655.jpg |
English: A lichen - Tephromela atra ("Black Shields") (Older synonym: Lecanora atra)
This lichen is "common on siliceous rocks and walls, rarely on trees, particularly characteristic on rocks by the sea above the high-tide mark" [Roger Phillips, "Grasses, Ferns, Mosses and Lichens of Great Britain and Ireland"]. This is one of very many examples of this species that were growing on rocks on the upper part of the beach. The photograph shows a mature specimen. This lichen often occurs "with a thin dark prothallus" [F.S.Dobson, "Lichens - An Illustrated Guide to the British and Irish Species"]; this is an area at the margin of the lichen which lacks algal cells (such a prothallus is visible in this photograph). The same work notes regarding the apothecia (the spore-producing discs) that these are "large, up to 3mm diameter .... When mature the disc is flat with a grey contorted and crenulate margin". [This species is similar to Lecanora gangaleoides, whose discs are persistently convex and have less contorted margins; also, if one of the discs is sliced open, T. atra shows an area of violet-brown colour inside, while L. gangaleoides shows a greenish-brown colour.] As for the lichen's common name, Black Shields, "The Oxford Book of Flowerless Plants" (Nicholson/Brightman) states that eighteenth-century naturalists used to refer to the discs (apothecia) as "shields". |
Date | |
Source | From geograph.org.uk |
Author | Lairich Rig |
Attribution (required by the license) InfoField | Lairich Rig / A lichen - Tephromela atra ("Black Shields") / |
InfoField | Lairich Rig / A lichen - Tephromela atra ("Black Shields") |
Camera location | 55° 56′ 50″ N, 4° 36′ 46″ W | View this and other nearby images on: OpenStreetMap | 55.947260; -4.612700 |
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Object location | 55° 56′ 50″ N, 4° 36′ 46″ W | View this and other nearby images on: OpenStreetMap | 55.947260; -4.612700 |
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Licensing
[edit]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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current | 23:57, 23 February 2011 | 640 × 480 (145 KB) | GeographBot (talk | contribs) | == {{int:filedesc}} == {{Information |description={{en|1=A lichen - Tephromela atra ("Black Shields") (Older synonym: Lecanora atra) This lichen is "common on siliceous rocks and walls, rarely on trees, particularly characteristic on rocks by the sea a |
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