Bacidina phacodes  

Thallus white to grey-green, thin to irregularly warted or scurfy, but never with discrete granules. Photobiont cells 7-10 μm diam.
Anamorph: conidiomata pycnidia, immersed, the walls hyaline. Conidia 28-50 (-60) × 1-1.5 μm, filiform, thinly 3- to 7-septate, ± straight, without a gelatinous sheath or appendages.
Teleomorph: ascomata apothecia, 200-500 µm diam., flat to strongly convex, often confluent and clustered, white, beige or pale orange-pink, the margin often paler than disc, soon becoming excluded. True exciple hyaline, K± pale yellowish, of radiating hyphae and sometimes with ellipsoidal cells <2 μm diam., but some cells to 4 μm diam. at the outer edge. Hymenium 35-50 μm high, hyaline or with the upper part pale yellow-brown, K± yellow. Hypothecium colourless. Interascal tissue of simple unbranched paraphyses 1-1.5 μm diam., the apices sometimes clavate, to 3 μm diam. Ascospores 29-45 × 1.5-2 μm, acicular but often gradually tapering towards the base, hyaline, thin-walled, 3- to 7-septate [the septa often inconspicuous], smooth, without a gelatinous sheath or appendages.