The Lichens of Italy: 284, 1993. Basionym: Buellia scheideggeriana Bricaud & Cl. Roux - Nova Hedwigia, 52: 169, 1991.
Distribution: N - VG (Tretiach & Carvalho 1993), Frl.
Description: Thallus leprose, episubstratic, granular, obscurely lobed at margins, with a thick, chalky medulla, always growing on the thalli of Leproplaca-species. Apothecia lecideine, black but ususally grey-pruinose, numerous, more or less immersed, with a flat to convex disc and a thin proper margin which is often excluded in old apothecia. Epithecium pale brown, with a layer of crystals; hymenium colourless, K/I+ blue: paraphyses simple, capitate at apex; hypothecium brown. Asci 8-spored, clavate, with a thick apex, amyloid, with a distinct axial mass, Bacidia-type. Ascospores 3-septate to submuriform, brown, 8-16 x 5-9 μm, often deformed or abortive. Photobiont chlorococcoid. Spot tests: thallus and medulla K-, C.-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: this is certainly a well-distinct species, to be looked for throughout Italy wherever Leproplaca chrysodeta and L. xantholyta are present. This mild-temperate lichen, however, seems to have a narrower ecological range than that of its hosts, being slightly more hygro- and less photophytic.