Chris Mattison / Black shield lichen (Lecanora atra), a crustose lichen found on siliceous rocks, Yorkshire, England, UK, July

Pete Oxford / Sea Cucumber (Actinopyga lecanora) measured during harvest, Puerto Ayora, Santa Cruz Island, Galapagos Islands, Ecuador

Pete Oxford / Sea Cucumber (Actinopyga lecanora) harvest, Puerto Ayora, Santa Cruz Island, Galapagos Islands, Ecuador

Adrian Davies / Black Shield Lichen (Lecanora atra) close ups, Devon coast, England, UK

Robert Thompson / Lichen {Lecanora chlarotera} Tollymore Forest, Newcastle, County Down, Northern Ireland, UK, January

Robert Thompson / Lichen {Lecanora pulicaris} and {Lecanora fuscidea lightfootii} on wood, Crom Estate, County Fermanagh, Northern Ireland, UK, March

Robert Thompson / Lichen {Lecanora chlarotera / pulicaris} Brackagh Moss NNR, County Armagh, Northern Ireland