White fungus on my mature maple tee
Thank you for your question about your maple tree. There’s a very good chance that the white spot is not a problem. It’s quite likely it is lichen. Lichens are common on woody plants, especially older, or slow-growing, specimens.
We should be able to identify the spot with several well-focused images. Please send an image of the tree, overall, another one or two of the spot. You can attach up to 3 pictures when you respond to this email. If you prefer, you can send additional images with a 2nd reply.
I look forward to seeing your images so that we can set your mind at ease.