Distribution: N - VG (TSB 35017), Frl (Tretiach 2015i), Ven (Lazzarin 2000b, Nascimbene & Marini 2007, Nascimbene 2008c), TAA (Nascimbene 2008b), Lomb, Piem (Isocrono & al. 2004), Lig (GDOR 490). C - Sar. S - Camp (Aprile & al. 2003b, Garofalo & al. 2010), Bas (Nimis & Tretiach 1999), Cal (Puntillo 1996).
Description: Thallus crustose, thin, continuous to cracked orange-pink to pale grey-green, becoming whitish in the herbarium, forming up to 10 cm wide patches. Apothecia usually numerous, sessile, constricted at base, round, 0.3-1 mm across, with a pale pink-orange, at first pore-like, then concave, thickly white-pruinose disc, and an crenate or radially cracked, whitish proper margin. Proper exciple pale pink to brownish yellow in outer part, colourless within; hymenium colourless or yellowish in lower part, non- or very weakly amyloid; paraphyses 1.5-2 µm thick, the apical cells up to 3 µm wide; hypothecium colourless. Asci 8-spored, thin-walled, lacking an apical apparatus or tholus, K/I+ blue. with uniseriate or partly biseriate spores. Ascospores transversally (3-)4-9-septate, bacilliform to slightly clavate (often broader at one extremity), 30-50 x 3-5 µm. Photobiont trentepohlioid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on shaded, steeply inclined faces of dolomitic rocks below the Alpine belt; certainly less common than G. jenensis, but probably more widespread, and often overlooked.