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[swiss]

Hi to all Biological experts here,

(I majored in Biology at school but I can't imagine what is responsible for this)

My girlfrieds Dad chopped of a rotten oak-tree. Then some hours later (it got dark) we noticed that the rotten oak-chunks were glowing in the dark.

I googled and wikipediaed until my fingers were bleeding but I couldn't get an answer why ? Something in these chunks made them glowing but what ?
I know of Plankton that glows when it dies and some mushrooms do that as well but I am not sure if mushrooms are responsible for it in this case.

Any suggestions anyone ?