Identify trees year-round! Introduction: Characteristics of bark. A brief overview of bark types. Detailed portraits of tree species with multiple close-up photos of the bark. The bark of each tree species is unique. With this handy nature guide, you can recognize 115 tree species by their bark. A short overview of bark types aids in orientation. Several excellent close-up photos for each tree species showcase the bark in all its facets. The plant portraits provide information on distribution, habitat, and tree height, as well as the appearance and texture of the bark.