- Genus 2: Butyriboletus (to which it will probably be moved when a specimen can be found for testing)
Tells: Red cap browns in old age & stains blue. Yellow pores & pale yellow cap flesh blue instantly. Well-netted stem yellow above & red by base. Uncommon.
Other Information: North American Boletes says the cap stains yellow, but that appears to be a typo based on all the photos I’ve seen. Think of a blue-staining, well-netted Bicolor Bolete & you’re pretty much there.
- NH4OH (Ammonia): No data.
- KOH: Cap flesh turns orange.
- FeSO4 (Iron Salts): Cap flesh turns grayish.