Trichomes on Elaeagnus leaf. Coloured scanning electron micrograph (SEM) of the underside of a leaf of Elaeagnus pungens showing trichomes. These scutiform (shield-like) trichomes are outgrowths of the leaf's epidermal layer. Trichomes have a variety of functions. Some serve to protect the leaf, others reduce evaporation and some secrete essential oils. Many have no known purpose. Elaeagnus pungens is a strong growing evergreen shrub often used for hedging. Magnification: x32 at 6x4.5cm size. Magnification: x90 at 6x4.5 inch size.