Thallus episubstratic, verrucose or rarely almost immersed, pale straw yellow. Apothecia 0.4-0.9 mm high, epruinose or sometimes with a faint greyish pruina on lower side of excipulum, 3-7 times as high as width of stalk. All parts of apothecium I-. Capitulum obovoid to lenticular, 0.10-0.15 mm diam. Excipulum of dark brown, elongate to almost isodiametric interwoven hyphae with thickened walls. Hypothecium dark brown, convex. Inner surface of excipulum sometimes lined by a layer of minute crystals that appear at the edge of the excipulum as a narrow, yellow zone surrounding the mazaedium. Stalk 0.10-0.15 mm diam., shining, black, epruinose, consisting of dark brown, periclinally arranged, intricately branched hyphae. Outermost layer pale, consisting of unsclerotized, irregularly arranged hyphae. Surface of stalk covered by a very thin, gelatinous I-, layer. Asci cylindrical with uniseriate spores, 40-51 × 4-5 µm. Ascospores ellipsoid, 10.5-14 × 4.5-7.5 µm, with minutely uneven and cracked surface. Chemistry: Thallus containing arthothelin, thuringione and thiophanic acid. Thallus K+ dull yellow, C+ orange, KC+ orange to red, Pd-, UV+ dark orange.