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Family: LecanoraceaeGenus: Lecanora
Thallus areolate, dispersed or forming a continuous crust, areoles flattened and subsquamulose or more commonly convex, sometimes strongly so, grey-green to grey. Soredia arising from soralia on the margins of the areoles, more rarely from their surface, concolorous with the thallus or white to blue-green or slightly yellow. Prothallus absent.
Anamorph: no information available.
Teleomorph: ascomata apothecia, 0.2-0.5 mm diam., often absent, sessile. Thalline exciple persistent, not or scarcely raised, entire. Disc pale- to pink-brown, flat, sometimes with blue-black pruina. Epithecium colourless to pale yellow, not granular. Hymenium 50-65 μm tall. Interascal tissue of paraphyses 1.5-2.5 μm diam., sparsely branched and anastomosed, apices not or slightly swollen. Ascospores not found in British material.
Chemistry: thallus C–, K–, KC+yellow, Pd–, UV+ dull orange (usnic acid, zeorin).