Arthothelium macounii is a highly oceanic species that is known from a single locality on Stord in Vestland. It is characterized by the brownish black maculate apothecia, orange-red pigment in the apothecia, and a thin, pale olive-grey thallus with trentepohlioid photobiont. The brown and warted spores are divided by 4–6 transverse and 1–2 longitudinal septa. The apical cell is enlarged.
Arthothelium macounii
(G. Merr.) W.J.Noble
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Andreas Frisch
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NTNU Vitenskapsmuseet
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Håkon Holien
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NORD Universitet
