Hymenelia ceracea (Arnold) M. Choisy = Ionaspis ceracea (Arnold) Hafellner & Türk

    Thallus crustose, to 10 cm diam., forming mosaics, slightly rimose, smooth and melted wax-like, ochre-orange, cream-ochre, light brown-orange. Apothecia usually numerous, scattered, regular but variable in size according to the development stage, the oldest to 0.3-0.5 mm diam., immersed, exciple distinct, paler, disc concave to flat, ochre-orange. Ascospores simple, broadly ellipsoid to globose, 13-20 x 6-11 µm according to literature, 13-22 x 7-13 µm according to our measures. K+ purplish-blue. Paraphyses simple and not branched. Pycnidia visible as red dots. Photobiont: Trebouxia. Typically grows on vertical walls of schist rocks, more or less humid and exposed to the North, near the seashore. According to C. Roux, this species is the same as Ionaspis lacustris, with the exception of its habitat.