FURTHER NEW METABOLITES FROM LICHENS

The new depsidones didechlorolecideoidin (1) [methyl 1-oxo-11H-dibenzo [b,e][1,4]dioxepin-7-carboxylate] and 4-dechlorogangaleoidin (2) [meth yl 1-oxo-11H-dibenzo[b,e][1,4]dioxepin-7-carboxylate] have been detect ed in the lichens Lecanora argentata and L. californica respectively, and the structure of these metabolites has been established by chromat ographic comparisons with synthetic material. The compound (1) has als o been shown to occur in the lichen Tylothallia pahiensis. In addition the dibenzofuran, furfuraceic acid roxy-1,9-di(2'-oxoheptyl)dibenzofu ran-2-carboxylic acid] (9) has been isolated from the lichen Phyllopso ra furfuracea, and the structure established spectroscopic methods.