Distribution: N - TAA (Nascimbene & al. 2009, 2010, Nimis & al. 2015). S - Cal (Puntillo 1994, 1996, Puntillo & Puntillo 2009).
Description: Thallus crustose, endosubstratic, poorly evident, rarely episubstratic and granulose. Apothecia stalked, pin-like, 1.3-1.8 mm high. Stalk covered in a greenish yellow pruina, of periclinally arranged, medium brown hyphae. Capitulum 0.2-0.4 mm across, obovoid to broadly obconical, yellow-pruinose on lower side, with a well-developed excipulum of periclinally arranged, brown hyphae. Mazaedium well-developed, brown; hypothecium obconical, dark brown, with a flat or slightly concave upper surface. Asci cylindrical, formed singly, dissolving early, with 1- to 2-seriate ascospores. Ascospores 1-celled, ellipsoid to short-cylindrical, brown, 6-7 x 3-3.5 µm, with a rough ornamentation formed by irregular cracks. Photobiont chlorococcoid, with globose cells. Spot tests: thallus K-, C-, KC-, P-. Chemistry: thallus without lichen substances; yellow pruina with vulpinic acid.
Note: a cool-temperate to southern boreal-montane lichen found in bark fissures of acid-barked deciduous and coniferous trees in humid montane forests, more rarely on lignum; probably overlooked and more widespread, but certainly never common. It is included in the Italian red list of epiphytic lichens as “Endangered” (Nascimbene & al. 2013c).