Description: Thallus crustose, thinly episubstratic, farinose, grey-green. Apothecia long-stalked, pin-like, 2-3.5 mm high. Stalk slender and flexuose, black, but covered in a thin, grey, granular pruina, consisting of periclinally arranged, medium brown hyphae, the outermost layer disrupted into pruina-like granules. Capitulum spherical, 0.2-0.4 mm across, with a poorly developed excipulum continuous with the stalk tissue. Mazaedium well-developed, pale grey; hypothecium medium brown. Asci ellipsoid, formed in chains from ascogenous hyphae without hooks, dissolving early. Ascospores 1-celled, very pale brown to almost hyaline, globose, 2.5-3 µm wide, with a smooth to slightly cracked wall. Photobiont chlorococcoid, with rectangular cells (Stichococcus). Spot tests: thallus K-, C-, KC-, P-. Chemistry: thallus with small amounts of several unidentified substances.
Note: a circumboreal-montane species found on rotting wood and decaying bark, on faces protected from rain such as hollows of old stumps in ancient, humid, montane to subalpine forests. It is included in the Italian red list of epiphytic lichens as “Vulnerable” (Nascimbene & al. 2013c).