Physcia verdonii was described from specimens collected west of Mimosa Rocks National Park in New South Wales, Australia.

Named and described by John Elix in 2011, the lichen's species epithet honours his colleague Doug Verdon.

[1] The Physcia verdonii thallus is typically orbicular, spreading up to 6 cm wide, and firmly attached to the substrate.

The upper surface is light to dark grey, often with a grey-white frost-like appearance at the tips and is devoid of reproductive soredia along the margins.

Rhizines are simple to squarrose-branched and vary in colour from whitish to brown, helping to anchor the lichen to its substrate.