Solenopsora holophaea (Mont.) Samp.
Thallus squamulose, 3-10 cm across, squamules crowded and overlapping, raised at margins (lip-like), more or less thick, brownish, brown-greenish, olive-brown when dry, bright green to greenish when moist, lower surface, pale fawn or pale leather with scattered pale rhizines. Apothecia frequent, soon sessile, 0.3-0.8 mm diam., disc flat, soon convex, dark brown, brown-darkish, exciple paler, soon excluded. Ascopsores colourless, ellipsoid, 1-septate, 12-18 x 4-5 µm. Pycnidia immersed in the thallus, brown-black. Photobiont: Chlorococcoid. Chemical spot tests negative. Coastal species, rather common, in crevices and cracks of soft rocks (micaschists) more or less acid or on ground but then hardly visible owing to the mat color when dry. N.B. In the field, sometimes difficult to distinguish from Romjularia lurida especially in case of dry weather, but the latter is not maritime, has squamules devoid of 'lips' and more lecideine apothecia, and slightly different colours: more brown-reddish when dry and less green when moist; a complementary microscopic observation is often required (ascospores simple for Romjularia lurida), but this trait may be misleading with specimen growing on alkaline rocks (see also Solenopsora holophaea forma).*