Fluorescence micrograph showing the cross-section of bulrush (Juncus sp.) leaf, autofluorescing red (chlorophyll on external side of leaf) and blue (vascular bundles). The diameter of the stalk is ap...

Scanning electron micrograph of stinging hairs on the surface of a nettle leaf. The large stinging hairs (trichomes) are hollow tubes with walls of silica making them into tiny glass needles. The bulb...