Name in North American Boletes: N/A
Tells: Slimy/viscid purple-to-pink red cap with red, blue-bruising pores that yellow w/age. Edge of skin on the cap. White to pale yellow flesh bruises blue & then darkens.
Other Information: Yellow stem w/red speckling at the bottom, often enlarges going down & then narrows at the ground. White mycelium. Blue bruising yellower stem flesh is often red lower down. Often has a pleasant “musky” odor. Dry caps are shiny. Has been described as “fake frostii” or “frostii with a different stem” due the similar cap color and sliminess. Likes oak and hickory, particularly red oak.
Science Notes: A European species with a very odd distribution that includes Iowa, Mexico, and North Carolina. People are still figuring it out.
Edibility: The books say “Unknown” but I wouldn’t touch a Rubroboletus. It is marked as “avoid” on this site due to its dangerous relatives.
- NH4OH (Ammonia): No data.
- KOH: No data.
- FeSO4 (Iron Salts): No data.