Thallus crustose, epiphyte, white-grey, with a brown prothalline line.
Apothecia arthonioid, covered with a red pruina.
Asci 8-spored; ascospores 3-5 septate 20-28 x 7-10 µm; hyaline then brown.
Photobiont: Trentepohlia
Spot test: red pigments K+ red violet.
Chemistry: different anthraquinones.
Habitat: On acid bark, in humid and non-nitrophilic environments.
Distribution: Holarctic, suboceanic. From the cold Atlantic forests to the more thermal ones of the Mediterranean Region.
Position in classification: Arthoniaceae, Arthoniales, Arthoniomycetidae, Arthoniomycetes, Pezizomycotina, Ascomycota, Fungi.
Location: Canyamars (Maresme)
Ecology: On Alnus glutionosa bark.
Altitude: 260 m
Climate: Central litoral Mediterranean (Tmm=12,0ºC, P=650 mm).
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