Carbacanthographis pseudorustica is a species of corticolous (bark-dwelling) lichen in the family Graphidaceae.

Found in insular Malaysia, it was formally described as a new species in 2022 by Shirley Cunha Feuerstein and Robert Lücking.

The type specimen was collected in 1965 by American lichenologist Mason Hale from a virgin peat dipterocarp forest in the Sungai Assan logging area (Sarawak).

The specific epithet pseudorustica recalls Allographa rustica, the name of a lookalike species that Hale had originally applied to his collections of this lichen.

[1] The lichen has a whitish to pale beige thallus lacking both a cortex and a prothallus.