Cyanoboletus rainisii

Yellow pores & stem stain green, resolving brownish. Dark cap stains greenish-black, growing paler as it cracks & fissures with age.

Description

Name in North American Boletes: Boletus rainisii

Genus: Cyanoboletus

  • Genus 2: Boletus

Species: rainisii

Common Name:

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).

Edibility: Unknown.

CHEMICAL TESTS:

  • NH4OH (Ammonia): No data.
  • KOH: No data.
  • FeSO4 (Iron Salts): No data.

Links:

National Audubon Society Field guide to Mushrooms, Gary Lincoff 0 Mushrooms of West Virginia and the Central Appalachians 0 North American Boletes 145

Got something to discuss?