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Morphology and composition of stinging hairs of Urticaceae. (A) Cryo-SEM micrographs of typical stinging hairs on leaves of Urtica dioica. Insert: silicified bulbous tip of stinging hair (red: high silicon content; green: organic compounds only; scale bars: 50 μm). (B) Element-mapping images. Line scans display concentration profiles from tip to base (green scale bar: 300 μm). Adapted from [130] with permission from John Wiley and Sons.
