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.
Under a microscope, they look like thin mushrooms. In many molds, the body consists of root threads that invade the food it lives on; a stalk rising above the food; and spores that form at the ends of the stalks. The spores give mold the color that you see. When airborne the spores spread the mold from place to place. Molds also have branches and roots that are like very thin threads. The roots may be difficult to see when the mold is growing on food and may be very deep in the food.