Arthothelium scandinavicum is the only Norwegian Arthothelium species that preferably grows on spruce. It is characterized by maculate, brownish black apothecia with often patches of orange pruina, and a thin whitish thallus with a trentepohlioid photobiont. The brown and warted spores are divided by 5–7 transverse and 1–4 longitudinal septa. The apical cell is not enlarged.
Arthothelium scandinavicum
Th.Fr.
|
Andreas Frisch
|
NTNU Vitenskapsmuseet
|
Håkon Holien
|
NORD Universitet
