in Thoreau’s Journal:

The red of oaks, etc., is far more general now than three or four days ago, but it is also much duller, so that some maples that were a bright scarlet can now hardly be distinguished by their color from oaks, which have just turned red….

PM  To Poplar Hill.  Maple fires are burnt out generally, and they have fairly begun to fall and look smoky in the swamps. When my eyes were resting on those smoke-like bare trees, it did not at first occur to me why the landscape was not as brilliant as a few days ago. The outside trees in the swamps loose their leaves first.