Aspen, one of the few broad-leaved trees to grow ... which in turn form oozing bruises under the bark. On another tree, Worrall finds small cracks like those on the surface of a cookie, a clue ...

While it is not one of the tallest, Pando is the world's largest tree and one of the oldest living organisms, which is one of the reasons it is so fascinating and worth seeing in person. The clonal ...

This enables the tree to absorb a small amount of the sun’s energy ... is found in much of Canada and the northern USA. In Utah, one stand of aspen has been identified as the world’s largest ...