Raphide  are needle shaped crystals of Calcium oxalate.
  • Found in Pistia, Colacasia etc. in their petiole
  • 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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