Soft rot fungus on an oak

[kram]

I'm unsure what this is, the fungus looks back and old. A large amount of wood at the base is soft, wet and powdery/crumbly, but I only probed it quickly with a stick. The oak is reasonably sized, has been reduced hard before, and would hit a house if it failed. However I know oak is very strong and resistant, I dont imagine it would fail anytime soon.

 

Sorry for the poor photo, phone was dirty.

 

A neighbouring tree about 50 meters away had Kretzschmaria, which failed with soft rotten roots in december. 

 

This looks more like a ganoderma or old turkey tail?

[kram]

Anyone?

 

Local council tree planning appear to be useless.