Species: borealis (North) or smithii (South)
- Species (Old): castaneus
Common Name: “Chestnut Bolete”
Tells: Stem stuffed with “cotton” & hollow when old. Flesh is hard and brittle. Brown cap edges often split & flare w/age.
Other Information: DNA testing tells us the U.S. has two lookalike species, borealis in the north and smithii in the south. The two are indistinguishable for practical purposes.
Science Notes: DNA evidence has divided the classic European species (G. castaneus) away from its American counterpart, which has itself been divided into versions: G. borealis (which grows in northern regions) and G. smithii (which grows to the south). There is, of course, a massive area of overlap where both species grow.
Edibility: Choice to most, good to the rest.
- NH4OH (Ammonia): Cap skin turns amber-orange. Cap flesh may turn pale brown, but not reliably.
- KOH: Cap skin may be negative or may turn yellow before fading to white. Cap flesh may turn pale brown, but not reliably.
- FeSO4 (Iron Salts): Cap skin does not react. Cap flesh may turn pale brown, but not reliably.