I don't worry about harvesting the Slipperies. By the time you strip off the skin and remove the sporangia, there's not a lot left and you have sticky yucky fingers to boot. The taste isn't that great either but they're one to keep in mind should food supplies fall short.
Any of the local pine forests have them. of course, one has one's favourite spots. This year, slippery jacks never went away. they kept popping up throughout the Summer and Saffrons started early too. Normally, we've got a good 3 months for where the yields make it worth going. This year, though...
!ctp