Raphide are needle shaped crystals of Calcium oxalate.
![Cystolith Cystolith](//lh5.ggpht.com/-38Yiz5NgIHs/U7AvGgbqtVI/AAAAAAAAC74/Mt8_rvKviwo/image%25255B14%25255D.png?imgmax=800)
![Raphide Raphide](http://lh4.ggpht.com/-UUXXCeBmCRg/U7AvEo59CmI/AAAAAAAAC7w/sQlMDKdPrhM/image%25255B11%25255D.png?imgmax=800)
- Found in Pistia, Colacasia etc. in their petiole
![Cystolith Cystolith](http://lh5.ggpht.com/-38Yiz5NgIHs/U7AvGgbqtVI/AAAAAAAAC74/Mt8_rvKviwo/image%25255B14%25255D.png?imgmax=800)
- Calcium carbonate crystals found in the leaves of Ficus
- Also found in members of the families of Acanthaceae, Curcurbitaceae .
- In Ficus leaves, these crystals are arranged in the form of bunch of grapes.
- In Momordica, double cystoliths are found in the epidermal cells.
- Cystolith are formed in specialized cells called lithocysts in leaves.
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