Mystery Bolete: Solved!
I was 99% certain I could eat the boletes I found on Thursday... but that 99% wasn't enough. Here are some shots:
My Audubon guidebook didn't contain the species, so this morning I decided to try again via my copy of James Kimbrough's Common Florida Mushrooms.
Lo and behold, it was in there! And it's edible! Check out these scans:
Everything matches... from the color to the look and the odor. And it was discovered under live oaks on a shaded lawn. Definitely Tylopilus tabacinus. With a confirmed ID in the bag... I put the mushrooms in the dehydrator and will soon make soup.
If you want to get your own copy of Common Florida Mushrooms, get it from the UF store - not from Amazon. It's a LOT cheaper. For a Florida mushrooms hunter, this book is a must-have.
A thanks also must go to permies.com, particularly to those who gave suggestions in this thread.