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. Medulla of the galls I+ blue. Apothecia lecideine, 0.3-0.6 mm across, with an often umbonate, black disc and a raised, brown-black, often cracked proper margin. Proper exciple of irregular chains of swollen cells, carbonaceous black in outer part, paler 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, 1.2-2 μm thick at mid-level, the apical cells 2-3(-3.5) μm wide; hypothecium brown to dark brown. Asci 8-spored, subcylindrical-clavate, the apex thickened, with a K/I+ pale blue apical dome usually with a distinct I+ blue, shallow subapical ring, Lecidea-type. Ascospores 1-celled, hyaline, broadly ellipsoid, 10-16 x 6-10 μm, the wall up to 0.8 μm thick. Pycnidia black, immersed. Conidia simple, hyaline, bacilliform, 5-9 μm long (not clear whether these are the conidia of the host lichen). 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: without 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.