1. The cells are non-dividing and reside in the stationary zone of the plant.
2. The cytoplasm of the cell is thin.
3. Cell nucleus is relatively small.
4. Cells are living or dead and asymmetric.
5. Cells are irregular in shape.
6. Their cells have cell cavities.
7. They have intercellular spaces.
8. Cells have a low metabolic rate.
9. Various designs are seen in cells.
10. Their cell walls are thick and made of lignin and pectin.