Arthonia fusca is a species growing on calcareous and base-rich rocks including anthropogenic substrates. The species is characterized by minute convex, black apothecia growing on a scurfy-granular thallus, chlorococoid photobiont, and colorless, 1-septate spores. It is difficult to distinguish from similar species without microscopical examination.
Arthonia fusca
(A. Massal.) Hepp
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Andreas Frisch
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NTNU Vitenskapsmuseet
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Håkon Holien
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NORD Universitet
