Hypoxylon on salix not sure if there is a specific one for salix.
No identification made yet.
No interactions present.
Entoleuca (Hypoxylon) mammata grows on willow so it could be that.
If it is Entoleuca (Hypoxylon) mammata then that can be a pathogen on poplar and I think its an invasive species in some parts of the world. possibly i will go back and collect a sample just incase anyone wants to have a look at it, there are various people investigating invasive species.
This year i have noticed large amounts of Hypoxylons of this general shape on a range of different tree species, much more than I'd noticed previously.
Lat/Lng: 51.958121, -0.638545
OS grid ref: SP936297