F. australiensis F. ferdinandmuelleri F. kiamae F. lhasanensis F. rexfilsonii F. scarlatina Filsoniana is a genus of squamulose lichens in the family Teloschistaceae.

Filsoniana was circumscribed in 2013 by Ingvar Kärnefelt, Arne Thell, Jae-Seoun Hur, Sergey Kondratyuk, and John Elix following a molecular phylogenetic analysis of the Teloschistaceae.

The outer protective layer (the cortex) of the lichen is made up of tightly packed, column-like cells arranged in a distinctive cellular pattern.

[2] When tested with potassium hydroxide solution (K), both the thallus and apothecia turn purple, indicating the presence of anthraquinone compounds, specifically those related to the chemical parietin.

This characteristic, along with its lobed or scaly growth form and distinctive cellular structure, distinguishes Filsoniana from the related genus Caloplaca.