Hi everyone, I am absolutely desperate for someone to please help me identify what could be wrong with my acer palmatum ‘Koto No Ito’ It has these weird marks all over the upper side of all its branches. I was thinking it must be some sort of fungus? The weird part is that the underneath of all those same branches are perfect and unmarked. I’ve tried to show this in the photo of the green underbranches. When I’ve wiped a branch with a wet cloth the white part of the marks is wiped away but the marks are all still there, darker underneath. I am at a complete loss as to what it could be, my local garden centre is clueless and I am desperate to not lose my beautiful tree. Thank you so much in advance for taking the time to look for me. Any and all advice gratefully received.