What is the appearance of surface staining fungi on wood?

Surface staining fungi on wood typically appear as a white powdery substance. This powdery appearance is a result of the reproductive structures and mycelial growth of the fungi, which often develop on the surface of the wood. These fungi do not decay wood but rather stain it, leading to changes in appearance that can affect the value and usability of the wood.

While there are various types of fungi that can have differing appearances, the characteristic white powdery mold is commonly associated with surface staining fungi. This staining can indicate potential problems with moisture levels and can affect the wood's integrity and aesthetic.

In contrast, other options describe different characteristics of wood decay or other fungi. Dark brown and crumbly might be indicative of wood rot, while glossy and shiny could refer to other fungal growths that have different impacts on wood. Black and sticky does not accurately describe the appearance of surface staining fungi and is more associated with specific saprophytic fungi or molds that have a different ecological role.