It hosts a phycobiont of the genus Phycopeltis, characterised by rectangular cells arranged in radiate rows.

Despite limited material, the formal description of Eremothecella cyaneoides was deemed necessary due to its systematic implications.

[2] The thallus of Eremothecella cyaneoides is epiphyllous, appearing either continuous across the leaf surface or marginally dispersed, with a smooth texture and whitish-grey colour.

Its apothecia (fruiting bodies) are adnate (closely attached), rounded or slightly irregular, measuring 0.7–1.2 mm in diameter, and feature a distinctive dark bluish-grey disc, often with a thick whitish pruina.

Pycnidia are applanate (horizontally flattened), greyish black, and similar in anatomy to Eremothecella macrocephala, while conidia are filiform (threadlike) and mostly broken into 1–3-septate pieces.