English: A lichen - Rhizocarpon petraeum. In older books, this may be listed under the synonym Rhizocarpon concentricum, a name that well describes its appearance. The concentric pattern is formed by many black dots arranged in rings; these individual dots are the spore-producing discs (apothecia).
This lichen was growing on rocks in the northern half of a disused quarry: 1050247. Compare another member of this genus which presents a very different appearance: 954017.
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.
tilvísun höfundarréttar – Þú verður að tilgreina viðurkenningu á höfundarréttindum, gefa upp tengil á notkunarleyfið og gefa til kynna ef breytingar hafa verið gerðar. Þú getur gert þetta á einhvern ásættanlegan máta, en ekki á nokkurn þann hátt sem bendi til þess að leyfisveitandinn styðji þig eða notkun þína á verkinu.
Deila eins – Ef þú breytir, yfirfærir eða byggir á þessu efni, þá mátt þú eingöngu dreifa því verki með sama eða svipuðu leyfi og upprunalega verkið er með.
== {{int:filedesc}} == {{Information |description={{en|1=A lichen - Rhizocarpon petraeum In older books, this may be listed under the synonym Rhizocarpon concentricum, a name that well describes its appearance. The concentric pattern is formed by many bla