Distribution: N - Ven (Ravera & al. 2021), TAA (Puntillo & Puntillo 2009), Piem (Puntillo & Puntillo 2009), VA (Puntillo & Puntillo 2018). C - Tosc (Ravera & al. 2018b), Abr (Nascimbene & al. 2021). S - Cal (Puntillo 1994, 1996, Puntillo & Puntillo 2009).
Description: Thallus crustose, endosubstratic and poorly visible. Apothecia long-stalked, pin-like. Stalk slender, 0.4-1.4 mm high, densely yellowish green-pruinose except sometimes in the black lowermost part, the inner part of periclinally arranged, medium brown hyphae, the outer part of dark brown, sclerotized hyphae. Capitulum spherical, 0.1-0.2 mm across, yellowish-green-pruinose, with a poorly developed excipulum of periclinally arranged hyphae, continuous with the stalk tissue and often reduced to a small basal collar. Mazaedium well-developed, dark brown, but heavily pruinose; hypothecium dark brown, with a convex upper surface. Asci cylindrical or irregular, formed in chains, dissolving early. Ascospores 1-celled, medium brown, globose to cuboid, 3-4 µm wide, with an irregularly thickened, sparingly cracked wall. Photobiont chlorococcoid, with rectangular cells (Stichococcus). Spot tests: thallus K-, C-, KC-, P-. Chemistry: thallus and pruina of the apothecia with pulvinic and vulpinic acids.
Note: on decorticated stumps of deciduous and coniferous trees, more rarely on bark and siliceous rocks in old humid forests, on faces slightly protected from rain. The species is included in the Italian red list of epiphytic lichens as “Endangered” (Nascimbene & al. 2013c).