A Field-to-kitchen Guide
by David W. Fischer and Alan E. Bessette
All of the super serious problems occur with gilled mushrooms (and as you know false morels are very toxic). There are good polypores that are easy to recognize safely (Grifola) and the bad boletes will only really make you very sick to your stomach if you get it wrong. There are general rules for boletes (not those with red tubes and blue staining in combination which puts you in section Luridi with Boletus satanus). Obviously they also have to taste good. B. edulus and Leccinum species are fairly distinct, but a relatively few number of individuals have GI reactions to the orange capped Leccinums. The Leccinums are all very tasty though and I don't know of any problems with the brown capped species. You have to look for Leccinum under Birch as they are symbiotic.