Well, I checked the boletes stew for more maggots (they're not huge - very thready) this morning and tossed out some more. I actually ate half of the mixture for lunch, pureeing it. As I think about it more and more, though, I plan to throw out the other pint and try to forgot that I ever ate little mushroom critters!
What I've learned: Be very, very picky about mushrooms just as Mahlon is. I was eager to try wild boletus but I really would rather not know when I'm eating insect larvae (the FDA allows a certain percentage of such critters in our food).