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I think it is Tephromela atra but I could be wrong.
Lichen is a composite organism made up of Fungi and Algae or Cyanobacteria.
Coastal rocks
Spotted on Jan 10, 2020
Submitted on Jan 17, 2020
3 Comments
All these Lecanora species are listed in Cornwall:
Lecanora strobilina
Lecanora handelii
Lecanora horiza
Lecanora ochroidea
Lecanora andrewii
Lecanora campestris subsp. dolomitica
Lecanora ecorticata
Lecanora epanora
Lecanora persimilis
Lecanora praepostera
Lecanora sambuci
Lecanora stenotropa
Lecanora subaurea
Lecanora subcarnea
Lecanora zosterae
Thanks, I erased the scientific name and left it blank for now.
Hi Malcolm, I think Tephromela all have black apothecia. Maybe Lecanora or Ochrolechia.. A few have come up that looked promising such as Ochrolechia parella, Lecanora carpinea, and other Lecanora species.