Cryo-SEM image of rapid frozen Barley leaf (Hordeum vulgare) - with Trichomes (hair like structure) and stomata pores on the epidermal surface. Very fine wax crystallites are also visible on the surface of the leaf and in red fungal mildew spores with sprouting fresh infectious tube. A short fungal tube is spreading along a groove formed by adjacent plant cells and not towards the stomata structure.
Credit: R. Wepf and U. Hässler
Source (Electron Microscopy ETH Zurich)