I have a type of fungus growing on my lawn that I'm unable to identify. It is of a dark grey colour on the upper surgace and ceamy white underneath and growns very close to the surface of the lawn. It has small "leaves" if you like, that look similar to curly kale leaves. What is this invader and how do I get rid of it? I was told once that it was called dog's wort but can't find any reference to this.