particular, Datura cultures glucosylated ca 90% of umbelliferone within 24hr after administration. Only Perilla cultures were capable of glucosylating rhein and emodin. The ability of glucosylating isomerichydroxybenzoicacids varied widely with culture strains. A culture strain of Mallotus transformed p -hydroxybenzoic acid to p - O -β- d -glucosylbenzoic acid and p -hydroxybenzoic acid glucose ester