Casparian strip -is confined to radial walls .e.g. Ranunculus. caspstrip1.jpg (20987 bytes)
Thickening on whole of radial walls.
Great thickening of radial walls and inner tangential walls. e.g. Iris root
Substantial thickening of all walls: protoplast is dead in mature cells.
Diagrammatic representation of typical endodermis cells.