Henssen ex P.M. Jørg., M. Schultz & Guttová, Herzogia, 26: 2, 2013.
Distribution: N - Frl, Ven (Nascimbene & al. 2021), Lomb (Jørgensen & al. 2013), VA (Matteucci & al. 2013). C - Tosc (Tretiach & al. 2008), Abr (Caporale & al. 2016).
Description: Thallus squamulose, homoiomerous, slightly gelatinous when wet. Squamules brown-black to black, dispersed to usually crowded to form effuse black-brown crusts, attached by a central point, to 3(-5) mm diam, shield-like, with an often lobulate to incised margin, not pruinose, often shiny, covered in granular isidia-like outgrowths which aggregate forming a dense bushy structure around the apothecia. Apothecia first immersed and perithecioid, but soon expanded, lecanorine, to 0.8(-1) mm across, with a dark reddish brown disc and a thick thalline margin. Hymenial gelatine I+ blue. Asci 4(-8)-spored, subcylindrical, prototunicate, thin-walled, with an amyloid apical cap. Ascospores 1-celled, hyaline, broadly ellipsoid to subglobose, 8-13(-17) x (4-)6-8(-11) µm. Pycnidia laminal, immersed. Conidia narrowly ellipsoid to bacilliform, c. 3 x 1 µm. Photobiont cyanobacterial, chroococcoid, of a few cells surrounded by a gelatinous sheath which is yellowish brown to purple near the thallus surface. Spot tests: all negative. Chemistry: no lichen substances.
Note: this species seems to be fairly common in central Europe (Jørgensen & al. 2013). It grows on steeply inclined, sunny surfaces of calcareous or basic siliceous rocks with periodical water seepage after rain, with optimum in upland areas. See also note on Anema moedligense.