Bright orange alga covering the bark on one side of a tall oak tree
No interactions present.
I too have observed this rust-like algal growth on numerous immature oaks in Swinley Forest (quite near Wildmoor Heath), and they appeared to be dead. Could this be connected to Trentepohlia infection?
Most unlikely I would have thought. Algae are not usually pathogens.
University of Edinburgh and Biodiversity Observatory (OU)
Lat/Lng: 51.3, -0.8
OS grid ref: SU8462