Caloboletus rubripes (“Western Bitter Bolete”)

Description

Name in North American Boletes: Boletus rubripes

Genus: Caloboletus

• Genus 2: Boletus

Species: rubripes

Common Name: “Western Bitter Bolete”

• Common Name 2: “Red-Stemmed Bitter Bolete”

Tells: Pale cap flesh blues instantly, tastes bitter & often smells bad. Yellow pores blue instantly. Buff to olive- or gray-brown cap bruises brown & often cracks & fissures w/age.

Other Information: Stem is yellow on top, & bright pink- to purple-red moving down, but can also be a plain buff. Stem bruises blue, then slowly fades to gray-olive. Confirmed findings in Long Island on west coast wood mulch.

Science Notes: DNA testing moved this mushroom from Boletus to a newly erected genus called “Caloboletus”.

Edibility: Avoid. Too bitter to eat.

CHEMICAL TESTS:

• NH4OH (Ammonia): No data.
• KOH: Cap flesh turns yellow-orange.
• FeSO4 (Iron Salts): No data.

Links:

• Mushroom Expert
• Mushroom Observer
• Wikipedia
• Google Image Search

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