[2] Squamules measure up to 2 mm in diameter and are round to irregular, with have a stipe.

[2] There are 0-16 apothecia per squamule, that may are pointlike (punctiform) with a reddish-brown round concave 0.1–0.3 mm disc that is deeply immersed in the thallus tissue.

[2] In very high elevations, the apothecia may rise as warty (verrucae) structure with thallus-like tissue (pseudo-lecanorine ) collaring discs that may be up to 1 mm diameter, with only one per squamule.

[2] Lichen spot tests are all negative, with no known secondary metabolites (as of 2014).

[2] A. obnubila was first described scientifically by lichenologist Adolf Hugo Magnusson in 1929.