The glowing fungus

As I was leaving Flat Rock in the fading light a few weeks ago, I thought my eyes were tricking me as I saw a subtle glow downslope from the main trail. I was pretty sure that some sort of fungus, about the size of several footballs placed end to end, was the cause. Sure enough, I find this unique fungus today exactly where I saw the glow. I don't know the name for it yet, but will post it once I find out.