The exodermis is a layer of cells from the outermost layer of the cortex of many angiosperms. Like the endodermis, its cells are very compact and are surrounded by a Casparian strip, two features which are used to restrict flow of water to symplastic rather than apoplastic flow through passages through the cells' membranes called plasmodesmata.
- Raven, Peter H., Ray F. Evert, Susan E. Eichhorn. (2005) Biology of Plants. 7th Edition. W.H. Freeman and Company Publishers