Umbilicaria cylindrica  

Thallus 2-5 (-10) cm diam., single- or multi-lobed, attached at a single point. Lobes to 5 cm broad, rounded, ± wavy and contorted with long, branched, black, marginal cilia. Upper surface pale to dark grey, sometimes tinged brown, smooth or wrinkled, the centre often slightly ridged, folded and ± white-pruinose. Lower surface rather smooth, grey-white, often tinged pink-brown towards the centre with sparse or densely packed rhizinomorphs, especially towards the margins. Isidia and soredia absent. Photobiont chlorococcoid.
Anamorph: conidiomata pycnidia, black, erumpent from the thallus, containing ± spherical thick-walled conidiogenous cells in chains, proliferating percurrently. Conidia 1.5-2 x ca 0.7 µm,  cylindrical, aseptate, hyaline. Thalloconidia absent.
Teleomorph: ascomata gyrose apothecia, frequent, 2-4 mm diam., ± flat, with a black, strongly gyrose disc, in a series of ± concentric folds, without a central sterile umbo. Interascal tissue of mostly un branched septate hyaline paraphyses, hardy swollen at the apices. Hypothecium thick, brown or blackish. Asci elongate-clavate, thick-walled, apical dome K/I+ blue, 8-spored. Ascospores 9-15 × 3-9 μm, aseptate, hyaline.
Chemistry: medulla C–, K±  yellow→red, KC–, Pd±  orange (± norstictic acid).