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.
Fungi do not have any way of making their own food, as plants do. In order to continue growing, they then must find a source to get their nutrients. They can grow well in dark places and do not need light as a source of life. Many types of fungi are similar to plants in appearance, but there are also many that do not resemble plants at all. For example, the mushroom is a common fungus that many people think of. Mushrooms look a little bit like plants but they must grow in an area where they can take in food from another source.