Orange Birches
Introduction
The photograph on this page of Orange Birches by Roger Jones as part of the Geograph project.
The Geograph project started in 2005 with the aim of publishing, organising and preserving representative images for every square kilometre of Great Britain, Ireland and the Isle of Man.
There are currently over 7.5m images from over 14,400 individuals and you can help contribute to the project by visiting https://www.geograph.org.uk

Image: © Roger Jones Taken: 15 Apr 2012
The Orange on the birches in this part of the forest is most likely algae of the genus Trentepohlia. See this article http://www.bioref.lastdragon.org/Chlorophyta/Trentepohlia.html by A.J. Silverside Thanks to Lairich Rig for the info