Lathagrium auriforme (With.) Otalora, P M. Jorg & Wedin

    Thallus 3-10 cm diam., foliose, made of wiggly lobes to 1 cm wide, rather thick, notably swollen and pulpy (0.5 mm thick) when wet,  ± erected, upper surface smooth, brown-greenish, dark olive-green, covered with isidia often numerous, crowded, globose (like pearls 0,2-0,8 mm diam.), clustured in dense groups and potentially covering the whole thallus center. Apothecia rare, 2-3 mm diam., disc brown-red, thalline exciple thin and isidiate. Ascospores ellipsoid to oval, submuriform, 26-36 x 8-13 µm. Photobiont : Nostoc. Chemical spot tests negative. Not especially maritime, rare, on calcareous rocks and soils and consequently in our region restricted to coastal quarries used to feed lime-kiln or on the walls in limestone or not very acidic.  N.B. See Lathagrium (Collema) fuscovirens that displays less thick lobes, and less swollen when moist.*