Distribution: N - Ven, TAA, Lomb, Piem (Morisi & Sereno 1995, Isocrono & al. 2004), Emil (Fariselli & al. 2020).
Description: Thallus crustose, very thin, continuous to rimose, grey, usually largely hidden by the apothecia. Apothecia biatorine, 0.4-0.7 mm across, numerous, crowded, sessile, rounded or more often angular by mutual compression, with a rusty-orange to orange-brown, finally often blackening, usually flat to slightly convex disc and a concolorous or slightly paler, thin, flexuose proper margin. Epithecium orange-brown, K+ red; hymenium and hypothecium colourless. Asci 8-spored, clavate, functionally unitunicate, apically thickened with a broad internal beak, the inner part of apex and external cap I+ blue, Teloschistes-type. Ascospores 2-celled, polarilocular, hyaline, narrowly ellipsoid, 11-16.5 x 3-4 µm, the equatorial thickening (“septum”) up to 1.5 µm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-; apothecia K+ red. Chemistry: thallus without lichen substances; apothecia with unidentified anthraquinones.
Note: on eutrophicated wood, more rarely on bark, on basal parts of isolated trees; a poorly understood taxon, which needs further study. The species is included as “Regionally Exctinct” in the Italian red list of epiphytic lichens (Nascimbene & al. 2013c). Vondrák (in litt.) has examined material distributed by Anzi, which proved to belong to Rufoplaca, a genus whose taxonomy at species level is still not very clear.