a mineral concretion, usually crystals of calcium carbonate, within the epidermal cell of the leaves of some plants, (for example Urticaceae), almost always visible as light coloured spots in the leaves.
The Burundi flora team(2025). Flora of Burundi: Glossary details: cystolith. https://www.burundiflora.com/speciesdata/glossary-display.php?glossary_id=196, retrieved 16 June 2025
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