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

Gary Bell/ Oceanwide / Granite rocks with lichen and Milky Way, Bicheno, Tasmania, Australia

Ernie Janes / Waves on the shore, with lichen covered granite, Bay of Fires, east coast Tasmania, Australia.

Michel Roggo / Shore of Lake Baikal, with lichen covered rocks, Lake Baikal UNESCO World Heritage Site, Siberia, Russia . Photographed for The Freshwater Project May 2015

Jim Brandenburg / Cliff with lichen, Judd Lake, Superior National Forest, Minnesota

Sean Crane / Orange lichen covered rocks along coast, Wineglass Bay, Freycinet National Park, Tasmania, Australia

Sean Crane / Orange lichen covered rocks along coast, Wineglass Bay, Freycinet National Park, Tasmania, Australia

Sean Crane / Orange lichen covered rocks along coast, Wineglass Bay, Freycinet National Park, Tasmania, Australia

Sean Crane / Orange lichen covered rocks along coast, Wineglass Bay, Freycinet National Park, Tasmania, Australia

Nick Upton / Black lichen (Lichina pygmaea) growing on rocks alongside Montagu's stellate barnacles (Chthamalaus montagui) high on the shore, Wembury, Devon, UK, August.

Nick Upton / Black lichen (Lichina pygmaea) growing on rocks alongside Montagu's stellate barnacles (Chthamalaus montagui) high on the shore, Wembury, Devon, UK, August.

Nick Upton / Black lichen (Lichina pygmaea) covering barnacle encrusted rocks high on the shore, Wembury, Devon, UK, August.

Nick Upton / Black lichen (Lichina pygmaea) growing on rocks alongside Montagu's stellate barnacles (Chthamalaus montagui) high on the shore, Wembury, Devon, UK, August.

Nick Upton / Black lichen (Lichina pygmaea) growing on rocks alongside Montagu's stellate barnacles (Chthamalaus montagui) high on the shore, Wembury, Devon, UK, August.

Nick Upton / Small periwinkles (Melarhaphe neritoides) attached to limestone rock encrusted with Tar lichen (Verrucaria maura) and Montagu's stellate barnacles (Chthamalaus montagui) high on the shore at low tide,...

Nick Upton / Small periwinkles (Melarhaphe neritoides) attached to limestone rock encrusted with Tar lichen (Verrucaria maura) and Montagu's stellate barnacles (Chthamalaus montagui) high on the shore at low tide,...

Nick Upton / Small periwinkles (Melarhaphe neritoides) attached to limestone rock encrusted with Tar lichen (Verrucaria maura) and Montagu's stellate barnacles (Chthamalaus montagui) high on the shore at low tide,...

Nick Upton / Many Small periwinkles (Melarhaphe neritoides) attached to limestone rock encrusted with Tar lichen (Verrucaria maura) and Montagu's stellate barnacles (Chthamalaus montagui) high on the shore at low...

Martin Willis / Granite covered with orange lichen, Bay of Fires, Ansons Bay, Tasmania, Australia

Martin Willis / Granite covered with orange lichen, Bay of Fires, Ansons Bay, Tasmania, Australia

Martin Willis / Granite covered with orange lichen, Bay of Fires, Ansons Bay, Tasmania, Australia

Martin Willis / Granite covered with orange lichen, Bay of Fires, Ansons Bay, Tasmania, Australia

Robert Thompson / Coastal landscape with rocky shore, Great Saltee Island, County Wexford, Republic of Ireland, June 2011

Wild Wonders of Europe / O. Haarberg / Lichen covered rocks on shore, Lngviksskr, Stockholm Archipelago, Sweden, June 2009

Wild Wonders of Europe / O. Haarberg / Lichen covered rocks on shore, Lngviksskr, Stockholm Archipelago, Sweden, June 2009

Konstantin Mikhailov / Ring lichen pattern on rocks on the shore of the White Sea, Karelia, Russia, June 2008.

Nick Garbutt / Shore lichen on rocks, Isle of Iona, Inner Hebrides, Scotland, UK

Tim Fitzharris / Lichen-covered rocks on Cadillac Mountain overlooking the Atlantic Ocean, Acadia National Park, Maine

Adrian Davies / Lichen {Ramalina siliquosa} growing on sea shore, UK

Yva Momatiuk & John Eastcott / Rocky seashore, steep cliffs with colorful lichens, Beaver Island, Falkland Islands

Yva Momatiuk & John Eastcott / Rocky seashore, steep cliffs with colorful lichens, Beaver Island, Falkland Islands

Adrian Davies / Exposed shore-line of reservoir with line of lichens indicating usual water depth, Bewl, Sussex, UK. Winter 2006

Michael & Patricia Fogden / Looper Moth (Geometridae) camouflaged against lichen-covered tree trunk, cloud forest, Costa Rica

Yva Momatiuk & John Eastcott / Atlantic Puffin (Fratercula arctica) pair perched in lichen covered coastal cliff, summer breeding season, Newfoundland, Canada

Yva Momatiuk & John Eastcott / Atlantic Puffin (Fratercula arctica) portrait of pair perched on lichen-covered coastal cliff, displaying their bright breeding colors, summer, Newfoundland, Canada

Yva Momatiuk & John Eastcott / Lichen covered coastal cliffs with surf, during summer, Baccalieu Island, North Atlantic, Newfoundland, Canada

Yva Momatiuk & John Eastcott / Sea cliffs and lichen, summer, Baccalieu Island, Newfoundland, Canada

Jaymi Heimbuch / Lichen-covered rocks, bay, and coastal mountains, Glacier Bay National Park, Alaska

Nick Upton / Shore / Sea Bristletail (Petrobius maritimus / brevistylis) camouflaged on limestone rock with patches of Black tar lichen (Hydropunctaria maura / Verrucaria maura) alongside four Small periwinkles (M...

Grant Maslowski / Shore plover (Thinornis novaeseelandiae) female, standing on rocky shoreline with lichen in the foreground, surrounded by cloud of small flies, Rangatira Island, Chatham Islands, New Zealand. Endanger...

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,...

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.

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.