My tree seems to be dying, but only on one side.
The trunk with the shelf fungus is rotten inside. Obvious one sided death on a tree usually means the roots on one side of the tree have died or disease has not infected the both trunks. The tree is a hazard and should be taken down before it comes down in a wind.
Thank you for the quick reply, I was worried it was gonna be bad news.
Sorry, it is hard to loose a tree.