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Family: LecanoraceaeGenus: Lecanora
Thallus continuous, forming neatly delimited patches, smooth to roughened or warty, pale grey or sometimes yellow-grey. Prothallus absent (black zone lines can sometimes form between genetically disinct colonies). Isidia and soralia absent. Photobiont chlorococcoid.
Anamorph: Conidiomata pycnidia. Conidia 10-14 μm long, cylindrical.
Teleomorph: ascomata apothecia, 0.4-0.8 (-1.5) mm diam., sessile, often aggregated. Thalline exciple well-developed, peristent, entire to irregularly crenulate or slightly warted, the medulla with massive irregular crystal clusters not dissolving in K. Disc flat, pale dull brown to rose-, orange- or red-brown, not or rarely slightly pruinose. Epithecium hyaline to grey-brown, overlain with numerous coarse granules (epipsamma) soluble in K and N. Hymenium 70-95 μm tall. Interascal tissue of paraphyses 1.5-2 μm diam., simple or sparsely branched, apices 2.5-4 μm diam., slightly swollen and yellow-brown, not capitate. Asci 65-80 × 10-15 μm, subcylindrical to elongate-clavate, 8-spored. Ascospores (9-) 11-13 (-15) × 6.5-7.5 (-8.5) μm, broadly ellipsoidal, aseptate, fairly thin-walled, smooth, without an epispora, gelatinous sheath or appendages.
Chemistry: thallus C–, K+ yellow, Pd–, UV reflecting mauve-purple (atranorin, gangaleoidin, ± roccellic acid, ± californin).