Arthonia arthonioides is a species of dry rock overhangs and the dry side of trees with acidic bark. It grows in humid forest habitats from Rogaland to Trøndelag. Arthonia arthonioides is characterized by black maculate apothecia on a thin to thick off-white thallus and trentepohlioid photobiont. The colorless spores are (2–)3-septate and have an enlarged apical cell.
Arthonia arthonioides
(Ach.) A.L. Sm.
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Andreas Frisch
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NTNU Vitenskapsmuseet
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Håkon Holien
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NORD Universitet
