Distribution: N - Frl (Tretiach & Hafellner 2000, Brackel 2016), TAA (Hertel & Schuhwerk 2010, Brackel 2016), Emil (Tretiach & al. 2008, Brackel 2016). C - Sar (Brackel 2016). S - Si (Brackel 2016).
Description: Thallus inapparent, growing inside the thalli of epilithic Lecidea-species, especially Lecidea lapicida, inducing the formation of white, gall-like, to 5 mm wide swellings. Apothecia lecideine, 0.3-0.6 mm across, with an often umbonate, black disc and a raised, brown-black proper margin. Proper exciple black along the outer rim, pale brown within; epithecium brown to olive-brown; hymenium colourless or most often with brown vertical streaks, 70-120 μm high; paraphyses coherent, branched and anastomosing, the apical cells hardly swollen; hypothecium brown to dark brown. Asci 8-spored, clavate, very thin-walled, with a K/I+ blue, tall tholus penetrated by a faintly amyloid apical cushion, the wall K/I-, surrounded by a blue outer layer, Lecanora-type. Ascospores 1-celled, hyaline, ellipsoid, 10-16 x 6-10 μm. Pycnidia black, immersed. Conidia bacilliform, 5-9 μm long. Photobiont absent (the galls have a chlorococcoid photobiont). Spot tests: all negative, but the galls often react K+ yellow turning red, C-, KC-, P+ yellow. Chemistry: no lichen substances, or norstictic acid from the host.
Note: a lichenicolous fungus found on exposed siliceous rocks near and above treeline, growing on the thalli of Lecidea lapicida s.lat., certainly occurring throughout the Alps.