I have also seen similar, but in woodlands-where the Green Elf Cups (Chlorociboria ) is the culprit. Never seen it as green as your piece of wood mind!
Just run a quick google search - I'm not shy to admit I find some bushcrafty answers by searching
"The Tunbridge Ware manufacturers had a good selection of local woods available such as oak, holly, yew, sycamore and maple which they combined with a number of foreign timbers and were able to achieve a range of colours including green which was obtained from oak trees attacked by fungus. " from this site http://www.tunbridgeware.org/page2
Prolly a lot more available to answer this but it's bed time
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