Flavoparmelia soredians (Nyl.) Hale
Thallus foliose, rosette-shaped, to 10-15 cm diam., tightly appressed, made of narrow and short lobes, 5-7 mm wide, pleated, thick , with a cardboard texture towards the center, upper surface yellow-greenish, pale grey-yellowish with farinose soralia in patches (and not pustulous), and minute farinose and elongated soredia, possibly forming small heaps. Apothecia rare, 0.5-1 mm, sessile, discs concave, brownish, margin concolorous. Ascospores simple, ellipsoid, 17-18 x 7-8 µm. Photobiont: trebouxioide. Cortex : K-, Medullae : C-, K+ yellow then red, KC+ red, Pd+ yellow-orange to orange. Coastal trends, on siliceous rocks in the aerohaline zone (much more than Flavoparmelia caperata) and apprently extending its distribution out of the aerohaline zone, seldom on wood or trees. Rather similar to Flavoparmelia caperata but smaller and with more minute soredia and a medullae K+ reaction, yellow turning red. N.B. When pseudocyphella can be observed, and C+ red, see Flavopunctelia flaventior.