Fungal Divers., 2016 (MB 817533). Basionym: Cyphelium marcianum B. de Lesd. - Bull. Soc. Bot. France, 55: 420, 1908.
Distribution: N - Emil (Nascimbene & al. 2021), Lig (Puntillo & Puntillo 2009, Brackel 2016). C - Tosc (Loppi & al. 1997c, Tretiach & al. 2008, Puntillo & Puntillo 2009, Brackel 2016), Sar (Puntillo & Puntillo 2009, Brackel 2016).
Description: Thallus crustose, grey, pillow-like or poorly evident, infecting the thalli of silicicolous Pertusaria-species. Apothecia immersed in thalline warts, 0.5-0.8 mm across, usually epruinose, with a black mazaedium. Exciple dark brown, of strongly sclerotized, interwoven hyphae, with an outer gelatinous layer, strongly thickened at base; hypothecium dark brown, of periclinally arranged, sclerotized hyphae. Asci narrowly clavate, formed singly from hooked ascogenous hyphae, persisting until the spores are nearly ripe, with biseriately arranged spores. Ascospores 1-septate and constricted at septum, brown, broadly ellipsoid, 11-13 x 6-8 µm, with an ornamentation of a few, spirally arranged, shallow wall fissures. Photobiont chlorococcoid. Spot tests: all negative. Chemistry: without lichen substances.
Note: a rare lichen growing on silicicolous pertusarioid species, especially. Ochrolechia microstictica, mainly Tyrrhenian in Italy.
Growth form: Crustose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)