ISA Certified Arborist Practice Exam

Identifying tree species by bark characteristics is primarily accomplished by observing features such as texture, color, and patterns, along with any distinctive attributes that may be unique to particular species. Bark can vary significantly among different species, providing a key aspect of identification. For instance, some species have smooth, thin, and light-colored bark, while others may exhibit thick, deeply furrowed, or peeling bark, each serving as a distinct identifier.

Additionally, certain species may have unique bark features such as lenticels, ridges, or scales which can assist in distinguishing them from others. This method of identification becomes especially useful when leaves are absent or when the tree is at a stage where leaf characteristics might not be fully visible, such as in winter.

In contrast, examining leaf shape, noting the tree's height and canopy shape, or evaluating root structure may provide insights into the tree's identity but are not as reliable or distinctive as bark characteristics for identifying tree species.