SPALTING
Spalting is any form of wood coloration caused by fungi. Found primarily in dead trees with Pigmentation being caused when fungi produce extracellular pigments inside wood. Dark dotting, winding lines and thin streaks of red, brown and black are known as zone lines. This type of spalting does not occur due to any specific type of fungus, but is instead an interaction zone in which different fungi have erected barriers to protect their resources.
Conditions required for spalting are the same as the conditions required for fungal growth: fixed nitrogen, micronutrients, water, warm temperatures and oxygen.
Water: Wood must be saturated to a 20% mointure content or higher for fungal colonization to occur. Wood placed underwater lacks sufficient oxygen, and colonization cannot occur.
Temperature: The majority of fungi prefer warm temperatures between 10 and 40 °C, with rapid growth occurring between 20 and 32 °C.
Oxygen: Fungi do not require much oxygen, but conditions such as waterlogging will inhibit growth.