1 Iritis is uncommon, but can be due to trauma, infections, or autoimmune conditions. Symptoms include pain, red eye, and often, decreased vision.  Optic neuritis. The nerve travelling from the back of the eyeball into the brain can become inflamed.
Oak root fungus, or white rot, is a widespread disease that becomes visible just beneath the bark and on roots. What looks like layers of light brown to tan mushrooms form in clusters at the base of the trees.
The good news is that this fungus is much more benign to the plant than many other fungal diseases like Black spot, Powdery mildew and Anthracnose. While it may not harm your plants it is definitely unattractive and downright messy when it starts growing on structures and furniture.