Description: Thallus inapparent, not lichenized, the hyphae developing inside the thalli of Phaeophyscia-species. Apothecia arthonioid, immarginate, breaking through the upper cortex of the host, more or less round, 0.1-0.3 mm across, with a black, sometimes grey-pruinose (remains of the epinecral layer of the host), flat to slightly convex disc, without a proper margin. Proper exciple poorly developed; epithecium pale olive-brown, 10-25 µm high; hymenium colourless, 30-40 µm high, I+ red, K/I+ bluish then reddish; paraphysoids branched and anastomosing, vertically oriented, 2-3 µm thick; hypothecium colourless to pale brown, 20-25 µm high, K+ grey. Asci 8-spored, broadly clavate to subglobose, semi-fissitunicate, with a large, non-amyloid apical dome, a distinct ocular chamber, and an amyloid ring-structure in tholus, Arthonia-type. Ascospores 1-septate, slightly constricted at septum, hyaline, obovate, 12-14 x 4-6 µm, with a gelatinous epispore. Photobiont absent. Spot tests: K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: a lichenicolous fungus, commensalistic or weakly parasitic on the thalli of Phaeophyscia-species, especially P. orbicularis; perhaps more widespread throughout Italy, at least in the North, below the subalpine belt; the species, however, seems to be rare south of the Alps, (von Brackel in litt.).