Xanthoparmelia mougeotii (Schaer. ex D. Dietr.) Hale
Parmelia mougeotii Schaer. ex D. Dietr.
Thallus foliose, forming rosettes, 2-5 cm diam., very closely appressed, made of lobes, narrow, radiating, not overlapping, storm lightning-like near margin, up to 2-3 mm wide,, indented and incised, upper surface uneven to humpy, grey-blue when moist, greyish to grey-yellowish, darker, more brown-black in the center that tends towards breaking down and then vanishing, soralia ± globose, farinose, grey-yellowish, 1-2 mm diam., sometimes numerous, merging, lower surface blackish, paler towards margins, rhizines short, simple. Apothecia rare, 1-2 mm diam., disc brown, thalline exciple entire, often sorediate. Ascospores broadly ellipsoid, simple, 6-9 x 4-5 µm. Photobiont: trebouxioide. Cortex : K- ; medullae : C-, K+ orange, KC+ orange, Pd+ orange. Not widespread in our prospection area, on well-lit siliceous rocks, sometimes near the sea-shores, more common on schist-slates inland.*