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 mycelium then absorbs these monomers, using a combination of facilitated diffusion and active transport. Just like an apple on a tree the mushroom is a fruit of these reproducing fungi. In nature the chances of mushroom spores germinating and then actually producing a mushroom are quite slim.