any ideas?

[arbogrunt]

I have no idea what it is, but by the comments on here and the look of it when I split it open (it was soft enough to pull apart by hand), I reckon its some sort of burr?. When broken apart its bright yellow with those white, hollow balls inside, but it quickly dries out to a brown colour, it doesn't smell like a fungal fruiting body, but smells 'woody' like cambium. Never seen anything like it!. Thanks for all your replies...

[treeseer]

Trees are so amazing! You could slice it and plant the sections round side up in moist sand and see if they grow into oak trees; fruit and olive trees have been propagated thusly.

 

Or blend with milk and sugar to make a novel beverage.

[arbogrunt]

well, after a couple of days, my fruiting bodies/burrs or whatever they are now look like this!