Nick Upton / Garden chair well covered with extensive growths of lichen, including filamentous forms (Usnea sp.), (Evernia prunastri) and Foliose (Flavoparmelia caperata), Cornwall, UK, August.

Ross Hoddinott / 'Oakmoss' lichen {Evernia prunastri} on oak tree branch, Exmoor National Park, Somerset, UK. October

Solvin Zankl / Lichens (Usnea filipendula, Evernia prunasti, Bryoria fuscescens, Hypogymnia physodes and Parmelia sulcata) on English oak tree (Quercus robur) near Norra Kvill National Park, Smaland, Sweden, August.

Solvin Zankl / Lichen (Evernia prunasti) on English oak tree (Quercus robur) near Norra Kvill National Park in Rumskulla socken, Smaland, Sweden, August.

Philippe Clement / Oakmoss / stag lichen (Evernia prunastri) close up, La Brenne, France, June.

Nick Upton / Garden chair well covered with extensive growths of lichens including Oakmoss (Evernia prunastri) filmanetous forms (Usnea esperantiana and other Usnea spp) and a foliose lichen (Flavoparmelia caperat...

Ross Hoddinott / 'Oakmoss' lichen (Evernia prunastri) on Oak tree branch. Tarr Steps, Exmoor National Park, Somerset, UK, October

Robert Thompson / Lichen {Evernia prunastri} on tree, Brackagh Moss NNR, County Armagh, Northern Ireland

Robert Thompson / Lichens {Evernia prunastri} and {Ramalina farinacea} growing amongst Hawthorn berries, Florencecourt Estate, County Fermanagh, Republic of Ireland, November

Robert Thompson / Lichens {Evernia prunastri} and {Ramalina farinacea} growing amongst Hawthorn berries, Florencecourt Estate, County Fermanagh, Republic of Ireland, November

Duncan Mcewan / Lichen {Evernia prunastri} on oak tree bark {Quercus sp}. Scotland, UK Inverness-shire

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.