Name in North American Boletes: Boletus tenax
- Genus 2: Boletus
Tells: Stem whitish (may tinge yellow) w/ broad, brown netting & often-“woody” base. Flesh slowly stains red-purple. Pores DNS or stain slightly red. Tastes sour.
Other Information: Likes oak & pine. Reddish-brown cap tends to crack by the edges & gets ever more uneven w/age. Xer. illudens is very similar but usually has netting that goes only partway down the stem, and usually lacks the tapered & woody stem base.
Science Notes: DNA testing moved this mushroom into the newly erected genus “Xerocomus.”
Edibility: The books still say “unknown” but your author has eaten and enjoyed it, and both the lookalike Xer. illudens and the almost-lookalike Xer. ferrugineus are considered “good.” The chances approach zero that no one has eaten tenax while believing it was one of those.
- NH4OH (Ammonia): Cap skin turns green, then blue, and then brownish gray.
- KOH: Cap skin turns brownish gray.
- FeSO4 (Iron Salts): No data.