Xanthoparmelia verruculifera (Nyl.) O. Blanco & al.

    Thallus foliose, up to 15 cm diam., lobate, lobes narrow, matt, transversally wrinkled, upper surface brown, dark brown with scattered, coarse coralloid isidia, possibly spreading out and becoming ± contiguous to form extensive mat on older parts of the thallus, crackling to form small crowded groups; lower surface black,  with simple rhizines. Apothecia very rare, with isidiate margin. Photobiont : trebouxioide.  Cortex K-, medulla C± pink-red, K-, KC± pink, Pd-. On horizontal surfaces of siliceous rocks in coastal and in land areas, preferring supralittoral well-lit xeric and aerohaline  situations. In the field, easily confused with  Melanelixia fuliginosa subsp. fuliginosa  that is much more common, with a bright thallus, smaller isidia and diffferent chemical reactions.*