Chris Mattison / Concentric boulder lichen (Porpidia crustulata) growing on siliceous rock (sandstone). Derbyshire, England, UK, September.
01520956
Chris Mattison / Two lichens, Concentric boulder lichen (Porpidia crustulata) and Lecidea lithophila, on sandstone. Derbyshire, England, UK, September.
01272160
Robert Thompson / Lichen {Porpidia cinereoatra} Skerrywhirry Mountain, County Antrim, Northern Ireland, UK, February
01272162
Robert Thompson / Lichen {Porpidia tuberculosa} Lough Salt, County Donegal, Republic of Ireland, UK, March
01272161
Robert Thompson / Lichen {Porpidia flavocruenta} Skerrywhirry Mountain, County Antrim, Northern Ireland, UK, February
