Gray/green fungus on plants
I have two azealeas that have a gray/green fluffy growth on a lot of the branches. It looks like the growths are comprised of tiny bumps or eggs. The plants have some dying branches and just generally the whole plants look sick with tiny leaves. Also I have one huge limelight hydrangea which has a green/gray growth on its branches but the growth is flat looking. The whole plant has drastically declined in health. The same goes for a huge vibrumium which has same growth as hydrangea and has lost branches and looks sickly. HELP.
It sounds like Lichens. There was a discussion on this topic before and I have attached the site https://ask.extension.org/questions/263737 regrettably the images are don't seem to be available any longer. But the original article can be found at https://pnwhandbooks.org/plantdisease/pathogen-articles/nonpathogenic-phenomena/algae-lichens-mosses...