Is this just white moss or a tree fungus...

[Lars Hansen]

Just curious if someone can identify it.

[Bjørn Rørslett]

Probably a fungus of some kind.

[ColinM]

Yes, I think it's a fungus too.
I saw several variants of this last weekend. The dampness and warmth in the UK is a dream for fungi.

[John Geerts]

Yes, it looks like a family-member of the 'Hericium' https://en.wikipedia.org/wiki/Hericium   and perhaps the Clathroides http://www.mantonature.nl/paddestoelen/slides/Hericium%20clathroides%20-%20Pruikzwam.html

[Frank Fremerey]

Is it edible? Looks really attractive structurally. A macro shot of it would be cool. Have one?

[Lars Hansen]

Thanks for all the feedback.

As John suggested it is a Hericium species - as far as I understand a Hericium coralloides. Can be mistaken for Hericium erinaceus but that is extremely rare in Denmark.

It's relatively rare in Denmark - one source suggests an estimated growth of 350 found at 47 known locations. So, even if it is edible (Frank) it would be a bit unfair!
It almost always lives on dying or dead beech trees - preferably very old ones.     

I did have my macro lens in the bag but ...  here is a crop instead     

[Frank Fremerey]

fascinating. like a tree covered in snow.

[elsa hoffmann]

indeed truly fascinating!