Name in North American Boletes: N/A
- Genus 2: Butyriboletus. Multigene DNA testing in 2019 suggests that the species probably belongs in Butyriboletus but those are raw results that have not been formally published.
Common Name: “Billie’s Bolete” (after the wife of Dr. Ernst E. Both)
Tells: Found only in Cape Cod. Chocolate- to purplish-brown cap. Red stem (especially low) with yellow reticulation. Pale yellow flesh stains slowly blue.
Other Information: Odor described as “reminiscent of chocolate chip cookies when dried!” Cap bruises reddish. Yellow pores age greenish on their way toward olive, and quickly bruise blue. Stem is deep red at the bottom, but may get yellower going up. Likes sandy soil. White mycelium.
- NH4OH (Ammonia): Cap surface turns amber.
- KOH: Cap surface turns dark amber before fading to red brown.
- FeSO4 (Iron Salts): Cap surface turns grayish green.