I was out for a Hammock hang and camp in Cornwall UK this past Monday. After having a small fire then letting it die out I went for a kip. I awoke later on and looked down from my hammock and saw a very bright area and it made me jump as I thought my fire had spread. After wiping my eyes and looking carefully I could see it was a Luminous patch almost as big as a dinner plate. I immediately thought it may be some kind of slugs or bugs grouped together. I spent ages watching it on and off throught the night waiting for it to stop. At dawn I looked where the glowing was coming from. I had snapped a large piece of deadwood underneath my hammock so I would not stand on it if I got up during the night. The glow was coming from inside both parts of the broken tree branch, could not see any glow in daylight but could see a white film of some kind of fungus.. Dont know what it was but I will never forget it.