Coenogonium  

Thallus crustose, thin and inconspicuous or well developed, smooth or granular, grey-green. Photobiont Trentepohlia.

Anamorph: conidiomata pycnidia, half to three-quarters immersed in the thallus, yellowish or whitish-pink, wall colourless. Conidiogenous cells 5-9 × 1.8-2.5 μm, arising singly or several together from branched supporting cells, cylindrical or bottle-shaped. Conidia ellipsoidal, aseptate, colourless, sometimes biguttulate.

Teleomorph: ascomata apothecia, sessile, marginate, concave-urceolate to flat, pinkish-white or pale yellow, at least when young, to yellow-orange. Thalline exciple absent. True exciple colourless, mostly pseudoparenchymatous. Hymenium 50-90 μm high, I+ blue. Interascal tissue of occasionally branched, distinctly septate paraphyses, usually branched near the apex with a pair of ± swollen apical cells. Asci 8-spored, narrowly cylindrical, wall thin, K/I+ blue, Catillaria-type. Ascospores ellipsoidal, 1-septate, colourless, smooth, without a perispore.
 
Chemistry: no lichen products detected by t.l.c.