Athallia vitellinula  

Thallus discontinuous with scattered to continuous convex areoles or weakly cracked-areolate, to several cm diam,  50-150 µm thick; areoles 0.1–0.5 mm diam, flat to slightly convex or uneven; pale greyish to greyish yellow or yellow. Margin normally thin and indistinct. Prothallus sometimes present, usually thin, white or pale yellow, film-like, occurring at the margin of the thallus or between areoles. Cortex usually poorly developed or indistinctly paraplectenchymatous.
Anamorph: conidiomata pycnidia, rarely observed, immersed, orange. Conidia 3.0–3.2 × ca 1–5 μm, broadly ellipsoidal.
Teleomorph: ascomata apothecia, normally present, sometimes abundant but usually scattered, 0.3–0.5 (–0.6) mm diam, ± sessile, round to irregular. Disc plane to convex, yellow to orange, often dark orange in old apothecia,  proper margin (0–)25–50(–75) μm thick, slightly raised or level with disc, concolorous with or paler than the disc, consisting of irregularly radiating, thick-walled hyphae 5–15 × 1.5–6 μm in size; thalline margin usually very inconspicuous and sometimes ± excluded, to 25 μm thick. Epihymenium orange, interspersed with granules; hymenium 50–80 μm thick, hyaline; hypothecium 35–80 μm thick, hyaline. Interascal tissue of paraphyses, simple to branched above, 2– 2.5 μm diam with upper cells to 6 μm diam, rarely if ever with oil-droplets. Asci 45–55 × 10–14 μm, cylindrical, 8-spored. Ascospores (8–) 9–12 (–14) × 4–6 (–7) μm, ellipsoidal, polarilocular, the septum (2.5–) 3.0–4.5 (–5.0) μm wide.