Ryan McMillen Southern Illinois University Plant Biology 1125 Lincoln Drive Carbondale Illinois 62901 USA Dumbremindr@aol.com
Psilotum, stomata, epicuticular wax
Stomata regulate gas exchange and are interspersed among flat tightly packed epidermal cells. This scanning electron micrograph was colorized to emphasize the sunken stoma of Psilotum nudum, commonly known as the whisk fern. Epicuticular wax is formed as webbing over the gaurd cells.