Environment Planet Earth 8 Ways to Identify a Tree by Its Bark In addition to leaves and flowers, you can look a tree's bark characteristics. By Mary Jo DiLonardo Mary Jo DiLonardo LinkedIn Twitter Senior Writer University of Cincinnati Mary Jo DiLonardo has worked in print, online, and broadcast journalism for 25 years and covers nature, health, science, and animals. Learn about our editorial process Updated March 21, 2022 Share Twitter Pinterest Email Thorsten Vernik / EyeEm / Getty Images Planet Earth Outdoors Weather Conservation If you are identifying a tree, you probably look at its leaves before anything else, or the tree's flowers or fruit if it has that. But don't forget about the tree's bark. At first glance, this protective outer coating of a tree's trunk and branches may seem like an unending sea of gray and brown. However, when you look more closely, you'll see variations in the colors and textures. Here are eight identifying tree bark characteristics you'll want to keep in mind. 1 of 8 Smooth, Unbroken Bark page / Flickr / CC BY-NC-ND 2.0 Young trees sometimes have smooth bark that's unbroken by ridges. Often this will change as trees age, according to Michael Wojtech who wrote the book, Bark: A Field Guide to Trees of the Northeast. But a few species, like the American beech and the red maple, keep their smooth, unbroken bark throughout their lifespans. 2 of 8 Peeling Bark Eko Prasetyo / Getty Images You have probably noticed peeling trees before. Does this mean they're dying? Not quite—Wojtech explained that the trees' wood is growing faster than the bark surrounding it, so the tree itself pushes outward against the bark. On some species, the pressure causes thin layers of the protective outer cork layer to separate and peel away. This is common to sycamore, birch, and maple trees, to name a few species. In the paper birch trees, in particular, the layers peel away in horizontal, curly strips. 3 of 8 Lenticels Eerik / Getty Images Lenticels are pores that move carbon dioxide and oxygen through a tree's protective outer bark. All trees have them, but they're more visible on some species than others, according to Iowa State University Extension and Outreach. Lenticels come in many different shapes, sizes, and even colors. Wojtech has identified that yellow birch trees have dark, horizontal lines, while young bigtooth aspens do not have lines at all but instead diamond-shaped lenticels. 4 of 8 Deep Ridges and Furrows parkerward / Getty Images If a tree has a very rough bark, take a look at its ridges and furrows. These are actually gaps in the bark's outer layers, called the rhytidome. Some species, like white ash, can have ridges and furrows that intersect. Others, like the Northern red oak, have uninterrupted ridges, while the white oak has ridges that are broken horizontally. 5 of 8 Scales and Plates John Lawson / Getty Images Instead of ridges, some trees have breaks in the rhytidome layers that look more like plates or scales. Many pine and spruce trees have scales of bark, while species like the black birch have thick, irregular plates on their trunks. 6 of 8 Color Vicki Jauron, Babylon and Beyond Photography / Getty Images In addition to the texture of a tree's bark, you can also pay close attention to the color and shade of a tree in order to identify it. Once you start looking, you'll find there's a lot more than just plain brown. Beech trees have a light gray bark, while black cherry trees have a dark red-brown. Black walnut trees have dark gray to black bark, and oak trees have a light gray bark. It can be difficult to keep track of the various colors, but sometimes the name of the tree will give you a hint. 7 of 8 Unusual Characteristics Thorns on a honey locust tree. Madison Muskopf / Getty Images Some trees are extra unique. Aside from ridges, lenticels, color, and peeling layers, some tree species grow additional parts that are very distinctive. On wild varieties of the honey locust tree, you can find large, red thorns on the trunk and branches. The thorns usually have three points, but can have many more, especially on the trunk. They look like spines and can grow to be three inches long. Similarly, the Hercules club—also known as the toothache tree—grows wart-like tubercles on its bark. 8 of 8 Smell Test That's right—one more way to ID your tree is by taking a whiff of its bark. While not all trees will have a distinct odor, some do. According to the National Park Service, the Ponderosa pine smells sweet, like butterscotch or vanilla. Similarly, The Master Gardners of Northern Virginia states that other pine trees smell like turpentine, while yellow birch smells like wintergreen, and sassafras trees can smell like cinnamon and spice. View Article Sources Jauron, Richard. "Shedding Bark." Iowa State University Extension and Outreach, Horticulture and Home Pest News. "Holes In The Bark Of Tree Twigs | Horticulture And Home Pest News". Hortnews.Extension.Iastate.Edu. Wojtech, Michael. "The Language of Bark." American Forests. January 2013. Fox, Vanessa. Depauw Nature Park Field Guide To Trees. Depauw University. "Gleditsia Triacanthos (Common Honey Locust, Honeylocust, Honey Locust, Honey Shucks Locust, Sweet Bean Tree, Sweet Locust, Thorny Locust) | North Carolina Extension Gardener Plant Toolbox". Plants.Ces.Ncsu.Edu. "Plants Of Texas Rangelands » Hercules Club, Toothache Tree". Rangeplants.Tamu.Edu. "Identifying Trees By Their Bark". Master Gardeners Of Northern Virginia.