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 DRC flora team(2025). Flora of the Democratic Republic of Congo: Glossary details: cystolith. https://www.drcongoflora.com/speciesdata/glossary-display.php?glossary_id=196, retrieved 3 July 2025
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