Arthonia calcarea is species of damp calcareous or base-enriched rocks including artificial substrates. It occurs in coastal Norway from Rogaland in the South to Ørland in Trøndelag. Arthonia calcarea is characterized by lirellate, black apothecia on a thin white to pale grey thallus and trentepohlioid photobiont. The colorless spores are 3-septate and lack an enlarged apical cell.
Arthonia calcarea
(Turner ex Sm.) Ertz & Diederich
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Andreas Frisch
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NTNU Vitenskapsmuseet
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Håkon Holien
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NORD Universitet
