Abstract
A new chemotype of Dimelaena oreina from California produces sphaerophorin as the major constituent and gyrophoric acid as an accessory of variable concentration. Chemical structures are proposed for two new orcinol-type para-depsides also detected in this chemotype. Isosphaeric acid is an isomer of sphaerophorin with a n-C7H,,-side chain on the A-ring and a one-carbon side chain on the B-ring. Superlatolic acid has the full reduced seven-carbon side chain on both rings. Fuscidea viridis, a new species described here from Norway and Sweden, produces all possible 4-O-methylated orcinol para-depsides with phenolic units having n-C5H11- and n-C7H5,- side chains. In addition to the major product, perlatolic acid, and a trace of superlatolic acid, two new depsides-hyperlatolic acid and
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