Arthonia apatetica is a common species on smooth to fissured bark of deciduous trees. It is characterized by minute convex, black apothecia growing on an indistinct to scurfy-granular thallus, chlorococoid photobiont, and colorless, 1-septate spores. Arthonia apatetica is difficult to distinguish from similar species without microscopical examination.
Arthonia apatetica
(A. Massal.) TH. Fr.
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Andreas Frisch
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NTNU Vitenskapsmuseet
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Håkon Holien
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NORD Universitet
