What feature distinguishes sapstaining fungi from other fungi?

Sapstaining fungi are specifically known for causing a distinctive bluish or grayish discoloration in wood when they infest it. This bluish appearance is a key characteristic that sets them apart from other fungi that may cause different kinds of damage or discoloration. The color change results from the pigments produced by the sapstaining fungi as they feed on the sap and nutrients within the wood, thus altering its visual properties significantly.

Other aspects regarding sapstaining fungi, while they may have some relevance in terms of their biology or habitat, do not specifically define them as effectively as their ability to cause this characteristic bluish staining. The ability to thrive in hardwoods might be a property of other fungi as well, and although some fungi may create distinct smells or have varying moisture retention qualities, these traits are not exclusive to sapstaining fungi. The bluish discoloration is a definitive and easily recognizable feature that allows you to identify sapstaining fungi clearly.