Aspen, one of the few broad-leaved trees ... 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 that ...

It has small rounded leaves with very small teeth along the ... Full article also can be viewed with Purdue Forestry and Natural Resources News: Trees of Indiana: Quaking Aspen.

Careful examination of an aspen trunk reveals that it is slightly green in colour, and this indicates the presence of chlorophyll there. This enables the tree to absorb a small amount of the sun ...