Alex Hyde / Lichen (Cladonia diversa) showing red apothecia (spore-producing structures). Cairngorms National Park, Grampian Mountains, Scotland, UK, February.

Chris Gomersall / 2020VISION / Close-up of Reindeer moss (Cladonia rangiferina), Frensham Common Nature Reserve, Surrey, England, UK, April

MYN / Piotr Naskrecki / British soldier lichen (Cladonia crisyatella) Concord, Massachusetts, USA, May. meetyourneighbours.net project

Bryan and Cherry Alexander / Reindeer lichen (Cladonia sp.) and the autumn russet catkins of Dwarf birch (Betula nana) on the tundra in Hurry Inlet. Scoresbysund, East Greenland, September.

Robert Thompson / Lichen (Cladonia ficerkeana) with red spore producing reproductive structures, Killarney National Park, County Kerry, Republic of Ireland, April

Robert Thompson / Lichen (Cladonia coccifera) with red spore-producing reproductive structures, growing in hummock of moss, Mourne Mountains, County Down, Northern Ireland, UK, January

Philippe Clement / Pixie-cup lichen (Cladonia fimbriata) on wood, Belgium

Philippe Clement / Pixie-cup lichen (Cladonia fimbriata) on wood, Belgium

Robert Thompson / Lichen {Cladonia squamosa} amongst moss, Mucross Wood, County Fermanagh, Northern Ireland, February

Robert Thompson / Lichen {Cladonia polydactyla} Ballymote, County Sligo, Republic of Ireland, February

Robert Thompson / Lichen {Cladonia floerkeana} with red reproductive structures, Rehaghy Mountain, County Tyrone, Republic of Ireland, January

Robert Thompson / Lichen {Cladonia ramulosa} Rehaghy Mountain, County Tyrone, Republic of Ireland, January.

Robert Thompson / Lichen {Cladonia portentosa} Rehaghy Mountain, County Tyrone, Republic of Ireland, January

Robert Thompson / Lichen {Cladonia uncialis subsp. biuncialis} Fawhaboy, County Donegal, Republic of Ireland, March

Robert Thompson / Lichen {Cladonia ramulosa} Crom Estate, County Fermanagh, Northern Ireland, March

Robert Thompson / Lichen {Cladonia cervicornis subsp. verticillata} Fawhaboy, County Donegal, Republic of Ireland, March

Robert Thompson / Lichen {Cladonia foliacea} Northern Ireland

Robert Thompson / Lichen {Cladonia cervicornis subsp. verticillata} Fawhaboy, County Donegal, Republic of Ireland, March

Robert Thompson / Lichen {Cladonia portentosa} Rehaghy Mountain, County Tyrone, Republic of Ireland, January

Robert Thompson / Lichen {Cladonia portentosa} Argory Estate, County Armagh, Northern Ireland, December

Adrian Davies / Lichen {Cladonia portentosa} Snowdonia, Wales, UK

Scott Leslie / Reindeer Moss (Cladonia rangiferina) on tundra, southern Labrador, Canada

Scott Leslie / Reindeer Moss (Cladonia rangiferina), Sheep's Laurel (Kalmia angustifolia), and Black Spruce (Picea mariana) at sunset, Canada

Konstantin Mikhailov / Cladonia sp lichen growing in Russky Sever NP, Vologda Oblast, N Russia, October 2008

Konstantin Mikhailov / Cladonia sp lichen growing in Russky Sever NP, Vologda Oblast, N Russia, October 2008

Konstantin Mikhailov / Mosses and Cladonia lichens growing in Russky Sever NP, Vologda Oblast, N Russia, October 2008

Konstantin Mikhailov / White Reindeer moss {Caldonia rangiferina}, near the White Sea, Karelia, N Russia, September 2007.

Luiz Claudio Marigo / Lichens (Cladonia sp) growing on the rainforest floor in the "campina" vegetation, at Campina Biological Reserve of the National Institute for Research in the Amazon, Amazonas State, Northern Brazil.

Jason Smalley / Buchaille Etive Mor with heather and lichen {Cladonia bellidiflora} Highland, UK

Russell Cooper / Pixie cup lichen {Cladonia sp} with fruiting bodies, UK

Doug Wechsler / British Soldiers Lichen {Cladonia crisyatella} with fruiting bodies, New Jersey, USA

Jose B. Ruiz / Lichen {Cladonia coccifera} in coniferous woodland, Spain

GRAHAM HATHERLEY / Lichens {Cladonia floerkeana} and {Cladonia portentosa} with fruiting bodies, Dorset, UK

Chris O'Reilly / Lichen {Cladonia rangiformis} heathland, Wales

Niall Benvie / Lichen {Cladonia sp} formed into polygons after drought, Norway

Niall Benvie / Lichen {Cladonia sp} formed into polygons after drought, Norway

Niall Benvie / Fruiting bodies of lichen (Cladonia sp) Scotland. Tomatin, Inverness-shire

Duncan Mcewan / Lichen {Cladonia arbuscula} on moorland rock. Scotland, UK Inverness-shire

Duncan Mcewan / Lichens {Cladonia coccifera} on moorland, Inverness-shire, Scotland

Jason Smalley / Lichen growing on sand dune {Cladonia portentosa} Merseyside UK

DOMINIC JOHNSON / Reindeer moss lichen (Cladonia rangiferina) and Liverwort, Siberia, Russia

Larry Michael / Pixie-cups lichen {Cladonia pyxidata} Michigan, USA

Duncan Mcewan / Lichen {Cladonia sp} on tree branch, Inverness-shire Scotland

Duncan Mcewan / Lichen {Cladonia coccifera} on moss covered moorland rock, Inverness-shire Scotland

Duncan Mcewan / Lichen {Cladonia coccifera & arbuscula} on moorland, Inverness-shire Scotland

Duncan Mcewan / Lichens {Cladonia spp} on moorland, Inverness-shire, Scotland

Ingo Arndt / Cup Lichen (Cladonia sp) growing on fallen tree trunk, Germany

Ingo Arndt / Cup Lichen (Cladonia sp) growing on fallen tree trunk, Germany

Igor Shpilenok / Reindeer moss {Cladonia rangiferina} growing by stream above Lake Baikal, Russia.

Jim Brandenburg / Cup Lichen (Cladonia sp) covering boreal forest floor, Minnesota

Konrad Wothe / Reindeer Moss (Cladonia rangiferina) with pine cone, Sweden

Michio Hoshino / Bearberry (Arctostaphylos uva ursi) and Cup Lichen (Cladonia sp) in tundra, Alaska

Ross Hoddinott / Close up of cups of Lichen {Cladonia fimbriata} UK

Duncan Mcewan / Lichen {Cladonia floerkeana} & moss {Rhacomitrium lanuginosum} Inverness-shire Scotland

Duncan Mcewan / Lichen {Cladonia arbuscula} amongst Myrtle {Vaccinium myrtillus} Scotland, UK

Jan Vermeer / Bengal Match Lichen (Cladonia floerkeana) in snow, Europe