© David Guimarães
Description: Lichen folióceo, round or oval, attached to the substrate in a single point (navel). Brown-colored, but whitish color due to the deposition of salts on the surface, and forming warts or pustules. The upper face of the stalk presents cylindrical, dark-colored cylindrical isids, branching like a coral, forming small tufts. Apotécios infrequent, black in color, flat, with margin, measuring about 2 mm.
Habitat: Frequent on granites, in very bright places.
Where to find in Arouca Geopark: Merujal (PR7); Pedra Posta site (G39); Pias do Serlei site (G12); S. Pedro Velho view (G3); Birch.