Druse (botany)
GROUP OF CRYSTALS OF CALCIUM OXALATE, SILICATES, OR CARBONATES PRESENT IN PLANTS
Druse (mineral)
A druse is a group of crystals of calcium oxalate, silicates, or carbonates present in plants, and are thought to be a defense against herbivory due to their toxicity. Calcium oxalate (Ca(COO)2, CaOx) crystals are found in algae, angiosperms and gymnosperms in a total of more than 215 families.