Bacidia rubella  

Thallus grey- to yellow-green, thinly to richly granular-isidiate, the granules 60-120 μm diam. Photobiont cells 5-17 μm diam.
Anamorph: conidomata pycnidia, 85-125 μm diam., pale pink to red-brown; conidia 16-24 × 0.5 μm, curved or sigmoid.
Teleomorph: ascomata apothecia, (0.4-)0.7-1(-1.3) mm diam., usually distinctly constricted below, flat, sometimes convex, pale to dark red-brown, the margin not well differentiated when ascomata are mature, but sometimes white pruinose. True exciple colourless but upper part pale yellow-orange or yellow-straw, sometimes (pruinose morphs) with radiating streaks of minute crystals, hyphae with lumina 1-2 μm wide or to 5 μm wide towards outer edge. Hymenium 70-105 μm high, colourless or faintly orange-red or yellow in the upper part; hypothecium colourless, or upper part pale yellow or orange-straw, K± yellow intensifying. Interascal tissue of paraphyses 1-1.5 μm thick, simple or forked above, the apices often slightly swollen to ca 2.5 μm. Ascospores (35-)40-70(-75) × 2.5-3(-4) μm, 3- to 7(-13)-septate, acicular, without a gelatinous sheath or appendages.