Name in North American Boletes: Boletus rainisii
- Genus 2: Boletus
Tells: Yellow pores & stem stain green, resolving brownish. Dark cap stains greenish-black, growing paler as it cracks & fissures with age.
Other Information: Yellow cap flesh blues instantly. Yellow stem flesh (red by the base) does too. Bright yellow stem has red tints near the base. Young specimens have a distinctly club-shaped stem (thicker at the top), but that evens out with age. Can be confused with Cyanob. pulverulentus, but that has does not instantly stain greenish-black.
Science Notes: DNA testing moved this mushroom from Boletus to a newly erected genus called “cyanodoboletus” (“cyano” referring to the characteristically brilliant blue stains).
- NH4OH (Ammonia): No data.
- KOH: No data.
- FeSO4 (Iron Salts): No data.