Athallia holocarpa (Hoffm.) Arup, Frödén & SøchtingThallus absent or developed only around apothecia, sometimes continuous, slightly cracked and verruculose; grey to grey-orange. Cortex usually poorly developed, composed of an amorphous layer or indistinctly paraplectenchymatous. Apothecia frequent, zeorine, 0.3-1(-l.2) mm across, with a flat to slightly convex, yellow-orange to orange disc and a concolorous or slightly paler proper margin, rarely with a poorly developed thalline margin in the basal part of young apothecia. Proper exciple 25-60(-75) µm wide, of irregularly radiating, thick-walled hyphae with rather long and narrow cells, measuring 5-15 x 1-3.5 µm; epithecium orange, granular, K+ purple-red, C-; hymenium colourless, (55-)65-80(-100) μm high, sometimes inspersed with oil droplets; paraphyses simple to sparingly branched in upper part, 2-2.5 μm thick at mid-level, the apical cells to 3-5 μm wide; hypothecium colourless, 50-80(-100) μm high, sometimes inspersed with oil droplets. Asci 8-spored, cylindrical, functionally unitunicate, apically thickened with a broad internal beak, the inner part of apex and external cap I+ blue, <i>Teloschistes</i>-type. Ascospores 2-celled, polarilocular, hyaline, ellipsoid to broadly ellipsoid, (9.5-)10-14(-15.5) x 5-8.5 μm, the equatorial thickening (“septum”) (3-)3.5-5(-5.8) μm, 1/3-1/2 of spore length. Photobiont chlorococcoid. Spot tests: thallus K- or K+ purple-red, C-, KC-, P-; apothecia K+ purple-red, C-. Chemistry: apothecia and orange-pigmented parts of thallus (when present) with parietin (major), fallacinal, emodin, teloschistin and parietinic acid (minor).