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.
Mycorrhizae: Plant-Fungus Partners. Unlike plants, fungi cannot make their own food. They absorb their food from dead organic matter, or other living organisms. The source of their food is called a substrate if it is dead, and a host if it is living.The body (mycelium) of a fungus is made of threads called hyphae.Hyphae absorb nutrients from the substrate, spread, grow, and produce fruiting bodies.he source of their food is called a substrate if it is dead, and a host if it is living. The body (mycelium) of a fungus is made of threads called hyphae. Hyphae absorb nutrients from the substrate, spread, grow, and produce fruiting bodies.