M. D. E. Knox

Xanthoparmelia minuta is a species of saxicolous (rock-dwelling), foliose lichen in the family Parmeliaceae. Found in South Africa, it was formally described as a new species in 1986 by David Knox and Mason Hale. The type specimen was collected from Pilgrim's Rest in the Mount Sheba Nature Reserve at an elevation of about 1,965 m (6,447 ft); there, it was found growing on open sandstone cliffs. Tightly attached to its rock substrate, the thallus of X. minuta is yellowish green in color and measures 1–1.5 cm (0.4–0.6 in) broad. It contains norstictic acid, salazinic acid, consalazinic acid,

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Xanthoparmelia acrita is a species of terricolous (ground-dwelling), foliose lichen in the family Parmeliaceae. Found in the Cape Province of South Africa, it was formally described as a new species in 1986 by the American lichenologists David Knox and Mason Hale. The type specimen was collected in the Ceres Mountain Fynbos Nature Reserve at Michell's Pass, at an elevation of 600 m (2,000 ft); there, it was found growing on the soil on low sandstone ledges. Characteristics of the species include its weakly convoluted lobes, and the presence of the secondary metabolites (lichen products)

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