Phylogenies are a fundamental tool for organizing our knowledge of the biological diversity we observe on our planet. But how exactly do we understand and use these devices? Tree diagrams have been ...

Cut into the trunk of a pine tree, and you will see a familiar series of concentric rings, each corresponding to a season of growth. But not all stumps tell the same story. A study published in ...

Steve Nix is a member of the Society of American Foresters and a former forest resources analyst for the state of Alabama. The cambium and its "zone" is a cell generator (reproductive tissue called ...