Steryl glycosides and acylated steryl glycosides have attracted the attention of both plant physiologists and biochemists, primarily because of the similarity between their properties and those of typical membrane lipids of the plant cell. Because of these similarities, both components, which are widely distributed in higher plants, are possibly involved in membrane function. Although a lot of information has accumulated about these plant lipids in the last few years, their significance for the plant itself is poorly understood. While many details about their occurrence and biosynthesis have been compiled, there exists a broad gap in respect to the metabolism and the physiologic function of steryl glycosides and their acylated forms. The field has been partially reviewed in relation to plant sterols [38] and the biosynthesis of glycolipids [60].