Description: Thallus inapparent, not lichenized, developing inside the thalli of Protoparmelia-species. Apothecia clustered, arthonioid, orbicular, 0.1-0.25 mm across, strongly convex and subglobose, shining black, at first immersed but becoming sessile or partially erumpent, the lower part cupulate and deeply immersed in the host thallus. Proper exciple thin, dark brown, made of hyphae resembing paraphysoids, K-, N-; epithecium dark brown, I+ red, K/I+ blue, K-, N-; hymenium almost colourless to orange-brown, c.50 μm high, I+ red, K/I+ blue K-, N-; paraphysoids branched and anastomosing 1.5-2 μm thick, the apical cells not swollen, pigmented; hypothecium dark brown, 200-230 μm high, penetrating deeply into the host tissues. Asci 8-spored, clavate, semi-fissitunicate, with a large apical dome, a distinct ocular chamber, without a K/I+ ring-structure in tholus. Ascospores 1-septate, hyaline, ellipsoid, 12-14.5 x 4-5 μm, with a narrow, K/I+ blue gelatinous sheath. Photobiont absent. Spot tests: K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: a lichenicolouos fungus growing on the thalli of Protoparmelia-species; known from Spain and the British Isles; there is an unpublished record from Italy (Sicily, herb. Brackel).