The draft genome is approximately 33.5 megabases in size, contains 6,931 annotated genes, and consists of 16.65% repeat sequences, predominantly LTR elements.

[6] Arthonia radiata is a crustose lichen with an immersed thallus, often separated from its surroundings by a thin brown line.

[7] Under a microscope, the apothecia have a thin epithecium (the upper layer) that is brown or olive-brown, reacting to certain chemical tests by turning pale green.

While its asexual reproductive structures, pycnidia, are rare, they are immersed in the thallus and black, with a pale green reaction in chemical tests.

[7] No secondary metabolites, often used to identify lichen species, have been detected in Arthonia radiata using thin-layer chromatography.