Typically measuring between 0.2 and 3 mm wide, these lobes present a flat or convex profile, often displaying concavity towards the tips and occasionally exhibiting a distinctive flabellate shape.

Notably, the presence of polysidiangia is observed, emerging from isidia-like outgrowths, which subsequently rupture to reveal soredia, ultimately forming an apically crateriform appearance.

[5][6] While apothecia are infrequent, they are found laminal on the thallus, measuring between 0.5 and 1.5 mm wide, featuring a black, slightly grayish pruinose disc.

Secondary metabolites identified include atranorin within the upper cortex, accompanied by divaricatic acid and a few terpenes in low concentration within the medulla.

[5][6] Dirinaria aegialita thrives within a diverse ecological range, commonly found on bark, wood, and rocks, spanning from sea level to the perimeters of montane rain forests.