Calvatia rugosa is an uncommon puffball and the only one I am aware of that stains yellow both on the flesh and the skin its also known as calvatia ruboflava. Its found in North america and also Australia and probably plenty of other places. I found it for the first time the other day and thought I would have a look and see what its got going for it. According to at least one source its edible when young but I had also heard reports that it is unpleasant. When I broke it open the flesh quickly turned yellow with the most intense colour change on the sterile base.
Calvatia rugosa is a small to medium sized puffball that can become quite wrinkled as it ages, its has a reddish skin made up of fine scales. The flesh is white but stains and bruises yellow, as does the skin. according to mushroom expert, the smell when young is not distinct but can become foul like rotting meat when mature, I did not wait to find out. The spore mass becomes orange brown to brown. This is such a unique puffball that i will not write a long description, QMS has one here. I decided to fry some up to have a taste, at first I thought it was burning very quickly but it was just turning bright orange!
I tried a small bit, the taste and texture was not unlike other puffballs I have tried. Thinking it was ok I had some more, this time it tasted quite bitter. I have never come across a colour change like that so I decided to boil some up to see if it would leach out in water. It did. A few days before we had been talking about mushroom dyes and this seemed like it could work, so I Left it to my more artistic partner to experiment with. She used some water colour paper and a scrap of cloth. Below are the results of a double soak. No additives were used and the colour seems quite stable. Its likely that the colour could be intensified with certain additives but we were impressed with the results. I did a search and only one mention of this fungi being used as a dye by anyone else (listed under calvatia ruboflava).