Trichomes
This image depicts multiple stages of hair, or trichome, growth on a very young leaf. The shape of a trichome varies by species. Here, multiple stages of growth are visible. This image was taken using a water vapor-based imaging system. Typically, images like this are taken using preserved material brushed in gold leaf. Using water vapor reduces the time required to get the image.

Emily Kief, undergraduate student, Botany Department