Robert Thompson / Reindeer moss (Cladonia portentosa) Peatlands Park, Portadown, Co. Armagh, Northern Ireland. November

Nick Upton / Reindeer moss (Cladonia portentosa) lichen growing on the mossy floor of a pine wood, Glengarry forest, Lochaber, Scotland, UK, September.

Colin Varndell / Lichen (Cladonia impexa), Winfrith Heath, Dorset, England, UK, May.

Chris Mattison / Reindeer moss (Cladonia portentosa) Peak District National Park, Derbyshire, UK

Philippe Clement / Reindeer lichen (Cladina portentosa) on pine tree bark, Italian Alps, Gran Paradiso National Park, Italy. June

Philippe Clement / Reindeer lichen (Cladina portentosa) on pine tree bark, Italian Alps, Gran Paradiso National Park, June

Robert Thompson / Reindeer lichen (Cladonia portentosa) growing on decaying branch, Ards Forest Park, County Donegal, Republic of Ireland. January.

Nick Upton / Reindeer moss (Cladonia portentosa) lichen growing on heathland around a coniferous tree stump, RSPB Arne Nature Reserve, Dorset, UK. January

Laurie Campbell / Reindeer lichen (Cladonia portentosa) on background of sphagnum moss (Sphagnum sp.), HIghlands, Scotland, UK. September.