Hi Steve

Starting with your last photo I reproduce this first. The next photo from E.Allen (filched off the internet) shows the internal rot of a fungus called Phellinus igniarius.


Phellinus igniarius.....Photo Steve Bedford


Photo E.Allen
The fungus is found in broadwood trees particularly beech and birch. Your tree could be beech but the tree in the second picture is definitely birch.

Next are two of your photos


Phellinus igniarius.....Photo Steve Bedford


Phellinus igniarius.....Photo Steve Bedford
The fungus is extremely variable and often misidentified.
There are many images on the web...Phellinus igniarius on the web

and next there follows a picture I took this morning of a particularly fine specimen of P.Igniarius on the base of a dying birch tree in our "garden".

It is 10 years old (count the layers) and 380mm across.

It grows from the top down adding a new layer each year.

and finally is a specimen I photographed at the RSPB Ynys Hir reserve measuring 560mm on 5th November 2006.

Cheers

Bob