Giralt, MireiaPaz-Bermudez, GracielaElix, John2015-12-100029-5035http://hdl.handle.net/1885/57185Five saxicolous species of Buellia s.l. containing xanthones are reported from the Iberian Peninsula: B. caldesiana, B. concinna, B. indissimilis, B. ocellata and a new species described here as B. vandenboomii. The latter also occurs in the Canary Islands (Tenerife). The status of B. indissimilis is clarified and an additional locality is reported for this rare species. The new combination Tetramelas concinnus is proposed.Keywords: Ascomycota; Buellia; Buellia concinna; Buellia ocellata; Lecanoromycetes; Physciaceae; Tetramelas Buellia s. l.; Chemistry; Lecanoromycetes; Lichen taxonomy; Physciaceae; Tetramelas200910.1127/0029-5035/2009/0089-03212016-02-24