Carbacanthographis pseudorustica
Carbacanthographis pseudorustica is a species of corticolous 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. It is similar to Carbacanthographis halei, but has larger ascospores. The specific epithet pseudorustica recalls Allographa rustica, the name of a lookalike species that Hale had originally applied to his collections of this lichen.
The lichen has a whitish to pale beige thallus lacking both a cortex and a prothallus. It has hyaline ascospores that measure 45–65 by 10–12 μm; these spores have between 11 and 15 transverse septa. Carbacanthographis pseudorustica contains stictic acid and constictic acid, which are lichen products that can be detected using thin-layer chromatography.