Candelariella reflexa (Nyl.) LettauThallus crustose, episubstratic areolate-subsquamulose, sorediate, the areoles abundant, well-developed, aggregated, sometimes forming distinct rosettes, flat to convex, often incised, greenish to yellow, up to 0.6 mm wide and 130 μm thick. Cortex 5-15 μm thick, consisting of 1-3 layers of more or less isodiametric cells; algal layer 40-75 μm thick; medulla spongy, of very loose, elongated hyphae. Soralia initially emerging from the middle of the areoles, 0.2.0.45 mm in diam., at first crateriform, later convex, sometimes becoming confluent but almost never forming large sorediate crusts. Soredia 40-70 μm in diam., the photobiont cells enclosed by 1-2 layers of 3-6 μm thick hyphae with some yellow-brown pigment. Apothecia rare, clearly lecanorine only when young, later appearing biatorine, 0.3-1.3 mm across, with an initially flat, then soon convex, yellow-orange to orange disc and an irregular, incomplete, soon excluded thalline margin. Thalline exciple c. 100 μm thick, with a paraplectenchymatous cortex; proper exciple up to 120 μm thick in upper part, of radiating hyphae with rectangular cells; epithecium yellow-brown, with a layer of yellow-brown granules insoluble in K, that sometimes extend downwards inbetween the paraphyses; hymenium colourless, 60-100 μm high; paraphyses simple or sparingly branched, 2.2-3.5 μm thick, the apical cells not or only slightly swollen; hypothecium colourless, with oil droplets. Asci 8-spored, clavate, with an apical dome which is I+ blue only in the internal, lower part, interrupted in the centre by a I+ paler blue strip, <i>Candelaria</i>-type. Ascospores 1-celled or rarely 1-septate, hyaline, narrowly ellipsoid, sometimes narrowing at one end, often guttulate, 12-18 x 4.5-6 μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-. Chemistry: pulvinic acid derivatives. 