Oakmoss, also known as Evernia prunastri, is a species of lichen, a fungus found in mountainous temperate forests all around the Northern Hemisphere. As its name already suggests, oakmoss grows commonly on the branches and trunks of oak trees, even though it may also be found on other deciduous trees and conifers. This bushy lichen is very short, flat and has a strap-like thallus that somewhat resembles the shape of deer antlers. Oamkoss varies in color, being minty green or almost white when dry, or dark-olive green and even yellowish when wet.