Description: Thallus squamulose, grey to brownish- or greenish-grey, loosely attached. Squamules 0.1-0.4 mm broad, bullate to slightly flattened, entire to crenate, dispersed or grouped, often articulate in the form of a Opuntia, densely covered by thin transparent hairs, sometimes blastidiate. Thallus paraplectenchymatous throughout, without a distinct cortex. Perithecia very rare, black, pyriform, without involucrellum, located among the squamules, 0.3-0.4 mm across (in section), with a rugose surface. Exciple distinctly 3-layered, with an outer layer of rounded, heavily pigmented cells, a median layer of similar, but unpigmented cells, and an inner layer of elongated, colourless cells; hamathecium of periphyses and periphysoids, interascal filaments absent; hymenial gel hemiamyloid. Asci 2-spored, clavate, thin-walled, fissitunicate, not or very weakly thickened above, I-, K/I-. Ascospores muriform, at first hyaline, then turning pale brown, ellipsoid, 60-70 x 25-28 μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a mild-temperate species found on terricolous mosses and plant debris over calcareous substrata, sometimes amongst mosses on basal parts of old trees, from the Mediterranean to the montane belt.