Brodoa intestiniformis (Vill.) Goward

      Folliose thallus forming more or less regular rosettes of 2-6 cm in diameter, formed of lobes 1-2.5 cm long and 1-3 mm wide, convex, rounded and thick at their ends colored light brown (like smoker's fingers), frequent secondary lobes forming from the center of the rosette. Upper surface pale gray, pale brown, graying and blackening. Underside more or less smooth and without rhizines, blackish. Apothecia quite rare, lecanorine, 4-5 mm in diameter, dark brown disc, slightly lobulated margin. Simple ascospores, hyaline, broadly elliptical or subglobose, 10-12 x 6-8 µm. Pycnidia very numerous, submerged and only visible in the form of a small blackish point. Conidia fusiform, 5-7 x 1 µm. Photobiont: Chlorococcoid. Cortex: C-, K+ yellow, KC-, P-; medulla: C-, K+ yellow → orange-brown, KC-, P+ orange. Mountain to alpine species found on snow-covered siliceous rocks in winter.

_ See Brodoa atrofusca, which is darker and lacks secondary lobes and especially a pink to red medulla.