Gary Bell/ Oceanwide / Lichen (Caloplaca sp) covered coastal rock, Flinders Island, Tasmania, Australia

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

Robert Thompson / Lichen (Xanthoria aureola) Ballywhoriskey Point, County Donegal, Northern Ireland. October.

Robert Thompson / Lichen (Xanthoria aureola) Ballywhoriskey Point, County Donegal, Northern Ireland. October.

Chris Mattison / Golden lichen (Caloplaca aurantia) Atlantic coast, Algarve, Portugal

Chris Mattison / Lichen zonation showing oil-tar lichen, Verrucaria maura (black zone), Caloplaca sp. and Xanthoria sp. (yellow zone) Mull, Scotland

Chris Mattison / Coastal lichen (Xanthoria aureola) Isle of Mull, Scotland, UK, June.

Chris Mattison / Elegant sunburst lichen (Xanthoria elegans) Baguales Valley, Chile.

Chris Mattison / Elegant sunburst lichen (Xanthoria elegans) Baguales Valley, Chile.

Chris Mattison / Yellow sunburst lichen (Xanthoria parietina) growing on a headstone, Fetlar, Shetlands, Scotland, UK, June.

Chris Mattison / Colony of lichens on granite rock, including Elegant sunburst lichen (Xanthoria elegans) - orange, Xanthoria candelaria - yellow, Rock posy, (Rhizoplace sp) - grey, and several others. Chile.

Alex Hyde / Common Orange Lichen (Xanthoria parietina) growing on a road sign. This species is very resitant to air pollution.Peak District National Park, Derbshire, UK. April.

Chris Mattison / Yellow Lichen (Xanthoria parietina) Valgrisenche, Italian Alps, Italy, July.

Nick Upton / Circular patch of Common orange lichen (Xanthoria parietina) growing on rocks just above the high tide line, Severn Beach, Somerset, UK, April.

Adrian Davies / Lichens including Xanthoria parietina and Ochrolechia parella on tombstones in village churchyard. Slapton, Devon, England, UK, July 2013.

Chris Mattison / Common orange lichen (Xanthoria parietina) on Hawthorn twig (Crataegus monogyna) together with a Shield lichen (Parmelia sulcata) England, UK. April.

Will Watson / Jelly ear fungus (Auricularia auricula judae) growing on Elder (Sambucus nigra) tree branch with Maritime sunburst lichen (Xanthoria parietina), Stocking Meadow Nature Reserve, Herefordshire, England,...

Chris Mattison / Wall pennywort (Umbilicus rupestri) growing on a stone wall, with various lichens (Caloplaca flavescens), Trellech, Monmouthshire, Wales, UK. December.

Robert Thompson / Lichens (Parmelia sulcata) and (Xanthoria parietina) growing on apple twigs, Peatlands and Annagarriff wood National Nature Reserve, Portadown, County Armagh, Northern Ireland, UK. September.

Nick Upton / Sunburst lichen (Xanthoria parietina) growing on limestone cliff tops at Stackpole Head, Pembrokeshire, Wales, UK, August.

Adrian Davies / Lichen (Xanthoria parietina) growing on gravestone in churchyard, Tintagel, Cornwall. May.

Chris Mattison / Bright yellow Lichen (Caloplaca flavescens) on limestone, Peak District National Park, Derbyshire, UK. April.

Adrian Davies / Lichen (Xanthoria parietina) growing on brick wall, does not grow on mortar, Romney Marsh, Kent, UK. June.

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.

Robert Thompson / Branch covered with different lichens Xanthoria parietina, Physcia tenella, Physcia adscendens, Peatlands & Annagarriff Wood NNR, County Armagh, Northern Ireland.

Adrian Davies / Seashore lichen (Xanthoria parietina) on rock. Cornwall, England, UK. July.

Nick Upton / Rock samphire / Sea Fennel (Crithmum maritimum) clumps flowering among coastal rocks encrusted with Common orange lichen (Xanthoria parietina), Rhossili, The Gower, Wales, UK, August.