Aleurodiscus oakesii is a cluster of small, gray-white, irregular cup-shaped saprotrophic fungi that grows on decaying hardwood tree bark.

The inner, fertile space of the cup-like fruiting bodies is darker in color in comparison to the sterile outer surface.

The spore-bearing bodies are tough in texture and attached to the bark by a single point, but the fungi lacks a stipe.

[10] It colonizes the outer bark of trees, especially white oaks, and eventually digests it, causing the "smooth patch disease" the fungus is most well known for.

[11] Aleurodiscus oakesii is the most common fungi to cause “smooth patch disease” on the nonliving outer bark of trees.