Fuscidea cyathoides (Ach.) V. Wirth & Vezda var. cyathoides
Thallus crustose, thickness and colour very variable, possibly forming large mosaics, smooth to rough, rimose, earthware-like cracked, areolate, areoles irregular, uneven-convex to 0.5-0.6 mm wide, grey-fawn to brownish, celadon-green with brown tinge (worn out specimen), brown-greyish, bluish-green when moist, prothallus sometimes patchy, dark brown or black, visible between areoles and bordering thallus. Apothecia ± abundant, sessile, 1-1.5 mm diam., disc flat then slightly convex, brown-black to blackish, exciple concolorous and paler, markedly wavy to lobate when fully developed, possibly excluded. Ascii 8-spored, 55-80 x 15-20 µm according to our own measures. Ascospores colourless when immature, brown when mature, simple, kidneybean-shaped (and in that case possibly 1-septate like), 9-13 x 4.5-6 µm according to literature, 10-13 x 5-7 µm according to our own measures. Pycnidia often abundant, brown, immersed. Photobiont: trebouxioid. Medulla: C-, Pd+ reddish, K+ dull yellow. Not especially maritime, with oceanic trends, frequent, forming large mosaics on siliceous rocks and sometimes on stones. The var. sorediata (H. Magn.) Poelt has brown-yellow to grey-greenish rounded soralia.