in Thoreau’s Journal:

Looked off from hill top. Trees generally are now bursting into leaf. The aspect of oak and other woods at a distance is somewhat like that of a very thick & reddish or yellowish mist above the evergreens—

In other directions the light graceful—& more distinct yellowish green forms of birch are seen & in swamps the reddish or brown crescents of the red maple tops—now covered with keys— Oak leaves are as big as a mouses ear….