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.

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 ...

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 ...