The Deuteromycete Trichothecium roseum produces significant amounts of mycosporine glutaminol during its sporulation phase. This production is improved when glucose is substituted by quinic acid in the culture medium. Data from the incorporation of [ l-14C\$cetic acid, [ 1-"Cjglyceric acid and [U-"C]3dehydroquinic acid are in very good agreement with the C6-CL unit (cyclohexenone) of fungal mycosporines originating from the first part of the shikimate pathway.