Arthonia excipienda is a pioneer species on smooth bark of deciduous trees in humid forests and woodlands. It is known in coastal Norway north to Leka in Nordland. Arthonia excipienda is characterized by brownish black, lirellate apothecia with a well-defined margin and slit-like apothecial disc, an indistinct thallus lacking photobionts. The colorless spores are 1-septate.
Arthonia excipienda
(Nyl.) Leight.
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Andreas Frisch
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NTNU Vitenskapsmuseet
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Håkon Holien
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NORD Universitet
