- The scytalidium species do not form mushrooms and are only obtained by coaxing the fungi out of the wood using laboratory clone techniques. Color range: pink/red with interactions that lead to blue, purple, yellow, other colors possible.
- The chlorociboria species are extremely slow-growing. This fungus produces the blue elf cup fungus. Blue-green stains are associated with this species.
- Color spalting is also seen with the Ophiostoma family of fungi that are carried by the pine beetle, creating blue-gray colorations in wood. Spore-producing fungus bodies are difficult to identify and do not resemble mushrooms. Due to the potential for damage from environmental release, the Ophiostoma family of fungi is tightly regulated by the USDA and are not commonly selected for spalting purposes. The pine beetle and the group of fungi that it spreads naturally have proven capable of destroying the potential value of forest products, this devastation also shows the importance of careful regulation of the movement and sale of spalting fungi. Even the fungus alone without the presence of the beetle has the potential to cause tree disease which may create preconditions enabling insect infestation.
Per Wikipedia: "The beetles introduce blue stain fungus into the sapwood that prevents the tree from repelling and killing the attacking beetles with tree pitch flow. The fungus also blocks water and nutrient transport within the tree." (Source https://en.wikipedia.org/wiki/Mountain_pine_beetle)