Endodermis

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In roots, this is the innermost layer of the cortex. The cells of this tissue layer have a ring of suberin around their cell walls that effectively stops apoplastic movement between the cortex and the vascular cylinder. In older roots, these cells often form a suberin lamella, a waterproof secondary wall.

 

• Link to image of a cross section of an immature Ranunculus root showing the endodermis with obvious casparian strips.
• Link to image of a cross section of a mature Ranunculus root showing the endodermis. Some of these cells have a suberin lamella, others with obvious casparian strips.
• Link to image of a cross section of a immature Ranunculus root showing the endodermis with casparian strips indicated.