[3] Ulf Arup and colleagues transferred the taxon to the genus Flavoplaca in 2013, following a molecular phylogenetics-based restructuring of the family Teloschistaceae.

Paraphyses (filamentous structures in the hymenium) are simple or slightly branched above, with 1–2 apical cells thickened, extending up to 7 μm wide.

The hypothecium (the tissue layer below the hymenium) is either hyaline or inspersed, consisting of thin-walled roundish cells measuring 53–125 μm.

The exciple (outer rim of the apothecia) consists of thin-walled oval to polygonal cells, with the upper side measuring 38–50 μm.

The key distinguishing feature of Athallia holocarpa is its apothecia, which have a more yellow tinge compared to the orange hue of Flavoplaca oasis.

Additionally, Athallia holocarpa has thicker and more prominent proper margins of the apothecia, and its spores have a broader isthmus, setting it apart from Flavoplaca oasis.

[5] Flavoplaca oasis has established a widespread presence across Europe,[6] and has been reported in Western Asia[7] and North Africa.

[8] The typical habitats for Flavoplaca oasis are substrates such as pure limestone, concrete, and mortar, indicating the species' preference for alkaline environments often found in man-made structures.