Slideshow image
Arthopyrenia grisea (Schleich. ex Schaer.) Körb.
Family: Arthopyreniaceae
Arthopyrenia grisea image

Global occurrence: Eurasia – Europe | Arctic.  Substrate: bark, cork, plant surface – trunks, branches, twigs.  Life habit: lichenized (mutualistic with algal photobionts).  Thallus: crustose (crustaceous) – endosubstratal, inconspicuous, immersed; [th marginal and upper surface] specific structures: absent.  Ascomata: absent | present; ascoma: perithecial, perithecioid – hymenial; ascoma [mm]: (median) 0.3.  Asci: fissitunicate – bitunicate; [asc] tholus: thickened; [asc] tholus amyloidity (iodine reaction): absent.  Ascospores: (median) 8.0; [asp] length [µm]: (low) 15.0 (high) 22.0; [asp] width [µm]: (low) 5.0 (high) 7.0; [asp] septa: present, transversely septate; [asp] transversal septa: (median) 3.0; [asp] pigmentation: hyaline, colourless.  Secondary metabolites: absent.  Primary photobiont: present; chlorophytaceous – trentepohliaceous, trentepohlioid. Secondary photobiont (eg in cephalodia): absent.