This review discusses the chemistry of 127 trioxygenated xanthones occ
urring in six families, 37 genera and 107 species of higher plants, an
d 55 which are fungal or lichen metabolites. The value of these substa
nces in connection with their pharmacological activity and the therape
utic use of some species is considered. The structural formulae of 130
compounds and their natural distribution are given. Copyright (C) 199
6 Elsevier Science Ltd