I work for the State of California. We have six coral trees, the exact species I have no idea. Something in infecting these trees. It appears to be a dark fungus attacking the bark. The bark peels back and falls away leaving truck and large limbs bare. The infected trees show few leaves and otherwise do not appear healthy. What is this and what is the remedy? Can they be saved. The trees are nearly twenty years old. They are on the north side of an office building.