SCOTLAND: The Big Picture / Puffin (Fratercula artica) with orange sea lichen (Caloplaca marina) covered roch behind, Shiant Isles, Outer Hebrides, Scotland, UK. June.

SCOTLAND: The Big Picture / Puffin (Fratercula artica) with orange sea lichen (Caloplaca marina) covered roch Shiant Isles, Outer Hebrides, Scotland, UK. June 2018.

SCOTLAND: The Big Picture / Razorbill (Alca torda) on orange sea lichen (Caloplaca marina) covered rock, Shiant Isles, Outer Hebrides, Scotland, UK. June

SCOTLAND: The Big Picture / Razorbill (alca torda) pair on orange sea lichen (Caloplaca marina) covered rock, Shiant Isles, Outer Hebrides, Scotland, UK

Guy Edwardes / Lecanora rupicola (Lecanora rupicola) lichen on gravestone, Unst, Shetland Islands, Scotland, August.

Chris Mattison / White rim lichen (Lecanora rupicola) growing on a headstone, Gower, South Wales, UK, June.

Chris Mattison / Lichen (Lecanora sp probably L. chlarotera) growing on a birch twig. Focus-stacked image, X3 magnification.

Chris Mattison / Crustose lichen (Lecanora gangaleoides) on coastal granite, Iona, Scotland, UK, June.

Chris Mattison / Sea ivory (Ramalina siliquosa) and Crustose lichen (Lecanora gangaleoides) on coastal rocks, Mull, Scotland, UK, June.

Paul Harcourt Davies / Lichen (Lecanora muralis) on basalt near Sugano, Orvieto, Umbria, Italy, September

Paul Harcourt Davies / Lichen (Lecanora muralis) on basalt near Sugano, Orvieto, Umbria, Italy, September

Chris Mattison / Black shield lichen (Lecanora atra), a crustose lichen found on siliceous rocks, Yorkshire, England, UK, July

Pete Oxford / Sea Cucumber (Actinopyga lecanora) measured during harvest, Puerto Ayora, Santa Cruz Island, Galapagos Islands, Ecuador

Pete Oxford / Sea Cucumber (Actinopyga lecanora) harvest, Puerto Ayora, Santa Cruz Island, Galapagos Islands, Ecuador

Adrian Davies / Black Shield Lichen (Lecanora atra) close ups, Devon coast, England, UK

Robert Thompson / Lichen {Lecanora chlarotera} Tollymore Forest, Newcastle, County Down, Northern Ireland, UK, January

Robert Thompson / Lichen {Lecanora pulicaris} and {Lecanora fuscidea lightfootii} on wood, Crom Estate, County Fermanagh, Northern Ireland, UK, March

Robert Thompson / Lichen {Lecanora chlarotera / pulicaris} Brackagh Moss NNR, County Armagh, Northern Ireland

Philippe Clement / Stonewall rim lichen / Robed rim lichen (Lecanora muralis), crustose lichen on rock, close up, France. June.

Chris Mattison / Pollution lichen (Lecanora conizaeoides), a pollution indicating lichen formerly the most common lichen in industrialised areas, now declining, growing on a fence post, Derbyshire, UK. April.

Robert Thompson / Branch covered with different lichens including Xanthoria parietina, Lecanora chlarotera with a lichenicolous fungus, Evernia prunastri and Physcia sp, Banbridge, County Down, Northern Ireland.

Will Watson / Crustose lichens on Silurian limestone stone wall with Black apothecia (Tephromela atra), Lecanora rupicola and Ochrolechia parella, Bradnor Hill, Herefordshire, England, November, focus stacked.

Adrian Davies / Black shield lichen (Lecanora atra) on rock. Cornwall, England, UK. July.