Flavoplaca limonia  

Thallus dull to bright yellow, often white-pruinose, forming a continuous areolate crust. Areoles/squamules (100–) 150–400  (–550) μm thick and (200–) 500-1500 (–2500) µm diam, flat, covered by blastidia or by laminal soralia of limonia type; soredia/blastidia 30–150 (–320) μm diam. Cortex alveolate, 5–25 (–55) μm thick.
Anamorph: pycnidial, conidia (2.5–) 3–4.5 (–5.5) × 1.0–1.5 μm.
Teleomorph: ascomata apothecial, frequent, (250–) 350 – 850 (–1600) µm diam. Disc in mature apothecia slightly concave to flat. Exciple (70–) 90–150 (–200) μm thick, zeorine, thalline exciple persisting in old apothecia, sometimes covered by blastidia/isidia. Hymenium 60–95 (–130) μm thick. Interascal tissue of simple paraphyses with tips widened to (3.0–) 4–5 (–6.0) μm. Ascospores (9.0–) 11.5–14.5 (–16.0) × (3.0–) 5.5 – 7.5 (–9.0) μm, length/breadth ratio ca 2.0. Ascospore septa (3.0–) 4.5 – 5.5 (–8.0) μm thick, ca 0.4 of ascospore length.