White fungus on a maple tree
Thank you for your question. The greenish structures in the middle photo is a lichen, a harmless growth regularly found on woody plants. The white entity matches no fungi growing on trees in your area (https://apps.extension.umn.edu/garden/diagnose/plant/deciduous/maple/branchesfungi.html). It maybe innocuous or an indication that the tree tissue under it has died, and is being decomposed. I suggest you contact your own county Extension service, where local staff can recommend a diagnostic plan. At a minimum, examination of the growth can be arranged, and a subsequent recommendation obtained. You can find your office here: https://cce.cornell.edu/localoffices Good luck!