Description: Thallus crustose, episubstratic, distinctly areolate, with whitish, applanate, polygonal clusters of crystals separated by thin, greenish thalline parts, forming 1-2(-3) mm wide, rounded or irregular patches. Hyphophores submarginal, their scales small, emerging on the outer edges of the areoles, obliquely orientated, squamiform but usually distorted and irregularly laciniate, 0.05-0.08 mm long, 0.07- 0.15 mm broad, pale greyish or whitish, sometimes with a bluish tinge at the base. Apothecia very rare, incompletely developed, rounded, 0.1-0.2(-0.25) mm across, with a pale to brown disc and a prominent, whitish to grey proper margin. Ascospores and pycnidia not known. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a recently-described foliicolous species known only from southern Italy and the Pyrenees, where it grows in very humid and warm sites. It is included in the Italian red list of epiphytic lichens as “Critically Endangered” (Nascimbene & al. 2013c).