Xanthoparmelia denudata

Xanthoparmelia denudata is a species of saxicolous, foliose lichen in the family Parmeliaceae. Found in Southern Africa, it was formally described as a new species in 1986 by the American lichenologist Mason Hale. The type specimen was collected in Cape Province, at an elevation of about ; there, it was found in a pasture growing on large exposed sandstone ledges. The dark yellowish-green thallus of the lichen reaches in diameter, although neighbouring thalli can coalesce to form larger units up to. The comprising the thallus are more or less linear in form, and measure 0.6–1.3 mm wide. Three secondary metabolites have been found in Xanthoparmelia denudata: salazinic acid, usnic acid, and skyrin.