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 Rwanda flora team(2026). Flora of Rwanda: Glossary details: cystolith. https://www.rwandaflora.com/speciesdata/glossary-display.php?glossary_id=196, retrieved 27 January 2026
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