The white spots on Dictyophora indusiata are not mildew of Dictyophora indusiata, but coating. When picking fresh dictyophora indusiata, the coating usually falls off automatically, but some will have a small part attached to it, which is invisible when it is just dried. The color of dictyophora is almost white.

However, when exposed to air, it will oxidize. After oxidation, the color will turn dark and yellow, and a white coating will appear. So don't worry if you find white spots on the bought dictyophora. This kind of dictyophora is edible.