Xanthoria karrooensis and X. alexanderbaai (Teloschistaceae), two new lichen species from southern Africa

Two new species, Xanthoria karrooensis S. Kondratyuk & Karnefelt and Xanthoria alexanderbaai S. Kondratyuk & Karnefelt, both apparently endemic to South Africa, are described and illustrated. Other xanthorioid species known from southern Africa are listed in a Table and a preliminary key is provided for the African species. The new species are compared with a number of presumably related species, and a Table is provided comparing the character states for the new species and related species. (C) 2002 Published by Elsevier Science Ltd on behalf of The British Lichen Society