Arthonia helvola is a rare species in the shady interior of humid old-growth forests. It is known from a single locality in Vang municipality, Innlandet. Arthonia helvola is easily identified by the dark orange to rusty red, maculate apothecia on a thin to indistinct thallus with trentepohlioid photobiont, and colorless, 2-septate spores without an enlarged apical cell.
Arthonia helvola
(Nyl.) Nyl.
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Andreas Frisch
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NTNU Vitenskapsmuseet
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Håkon Holien
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NORD Universitet
