Oxidosqualene cyclase that generates taraxerol, a triterpenoid product. Taraxerol is probably required to coat the leaf exterior as a defense compound against pathogens or herbivores. (S)-2,3-epoxysqualene = taraxerol Expressed only in the epidermal cells on both sides of the leaf and not in internal leaf tissues. Belongs to the terpene cyclase/mutase family.