Butyriboletus peckii

Pale cap flesh w/red larval tunnels, blues slightly, & tastes sour or bitter. Yellow pores stain blue but resolve brown. Red & yellow netted stem.

SKU: Boletus peckii Categories: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,

Description

Name in North American Boletes: Boletus peckii

Genus: Butyriboletus

  • Genus 2: Boletus
  • Genus 3: Caloboletus

Species: peckii

Common Name:

Tells: Pale cap flesh w/red larval tunnels, blues slightly, & tastes sour or bitter. Yellow pores stain blue but resolve brown. Red & yellow netted stem. Very rare.

Other Information: Red to brownish cap. An extraordinarily rare mushroom.

Science Notes: DNA testing moved this mushroom from Boletus to a newly erected genus called “Butyriboletus,” but see the discussion in the text and comments at Mushroom Observer #246697, which points out that (a) questions exist about proper identification of the 1963 specimen that got DNA tested, and (b) the bitter taste and overall morphological “look and feel” match up better to the new genus Caloboletus.

Edibility: Unknown, but unlikely given the bitter taste.

CHEMICAL TESTS:

  • NH4OH (Ammonia): Cap surface turns deeper red (yellow in bleached areas) and then dingy gray-olive. Cap flesh turns yellowish, with greenish blue near the tubes.
  • KOH: Cap turns rusty red. Cap flesh turns bright orange.
  • 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 138 182

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