Distribution: N - Ven (Nascimbene & al. 2013b), TAA (Thor & Nascimbene 2007).
Description: Thallus crustose, episubstratic, effuse, olive-green, minutely granular, composed of 20-40 µm wide goniocysts containing orange granules reacting K+ and C+ violet. Apothecia very rare, micareoid, 0.2-0.5 mm across, often tuberculate, pale brown to grey-brown, with a strongly convex disc, without a proper margin. Proper exciple indistinct; epithecium yellowish brown, K+ violet; hymenium colourless, often with irregular, brownish vertical streaks reacting K+ violet; hypothecium colourless to yellowish. Asci 8-spored, cylindrical-clavate, the I+ blue tholus with a wide, I+ dark blue tube structure that expands towards the top, without a pale axial body. Ascospores 0(-1)-septate, hyaline, ellipsoid, ovoid or oblong, 6.5-12 x 2.5-4 μm. Pycnidia stalked, cylindrical, usually unbranched, 0.2-0.5(-1) mm tall, the stalk pink-brown or grey-brown, but covered in a whitish tomentum, the wall K+ and C+ violet. Mesoconidia narrowly ellipsoid, 4-6 x 1.2-1.7 μm. Photobiont micareoid, thin-walled, the cells 4-7 μm wide. Spot tests: thallus K- or K-+ faintly violet, C- or C+ faintly violet, P- (reactions best visible under the microscope).
Note: a rather rare species growing on wood (mostly on the vertical surfaces of stumps) and rotting roots of conifers in montane to subalpine forests, ranging from the Alps to northern Europe. It is included in the Italian red list of epiphytic lichens as “Critically Endangered” (Nascimbene & al. 2013c).