Adrian Davies / Orange coloured Seashore Lichens (Xanthoria parietina) and Sea Ivory (Ramalina siliquosa) UK, August

Staffan Widstrand / Wild Wonders of China / Tree lungwort (Lobaria pulmonaria) growing on tree in humid montane mixed forest, Laba He National Nature Reserve, Sichuan, China

Chris Mattison / Fruticose lichen (Ramalina fastigiata) among others, growing on a dead Sycamore twig, Catbrook, Monmouthshire. Focus-stacked image.

Sue Daly / Sea ivory lichen, (Ramalina siliquosa), Sark, British Channel Islands, April.

Chris Mattison / Lichen (Ramalina sp) growing on a pine cone. Atlantic coast, Algarve, Portugal

Nick Upton / Tree lungwort / Lung lichen (Lobaria pulmonaria) growing on a treetrunk in ancient Atlantic woodland, Knapdale Forest, Argyll, Scotland, UK, May.

Nick Upton / Tree lungwort / Lung lichen (Lobaria pulmonaria) patch growing on a tree trunk in montane Laurel forest, Anaga Mountains, Tenerife, May.

Cyril Ruoso / Tree lungwort (Lobaria pulmonaria) lichen in ancient forest,, Alberes Mountains. Massane reserve, Pyrenees, France, November.

Alex Hyde / Basalt covered in various coastal lichen species including Sea ivory (Ramalina siliquosa). Anglesey, Wales, UK. December.

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

Alex Hyde / Tree Lungwort (Lobaria pulmonaria) lichen close up, Kyle of Lochalsh, Scotland. March.

Alex Hyde / Tree lungwort (Lobaria pulmonaria) lichen growing on a mature beech tree. Kyle of Lochalsh, Scotland. March.