Xerocomellus rainisiae

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: Xerocomellus

  • Genus 2: Cyanoboletus
  • Genus 3: Boletus

Species: rainisiae

  • Species 2: 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 Cyanoboletus cyaneitinctus, 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, and then on to Xerocomellus.

Edibility: Unknown, but the other species in this genus are good.

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

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