This forest community, sometimes called the mountain boreal forest, is comprised largely of conifer tree species ... together with sugar maple, yellow birch, and American beech are the dominant ...

Across western North America, in millions of acres of pine forest, the story is ... blue stain seeping through the yellow wood. It’s a telltale sign of a tree that was killed by mountain pine ...

UC Davis Professor Hugh Safford was hiking for pleasure in California's High Sierra when he stumbled upon a new elevation ...