Butyriboletus primiregius (“Red-Capped Butter Bolete”)

Description

by Alan Rockefeller	by Alan Rockefeller
Yes, the pores do bruise blue. By Alan Rockefeller

Name in North American Boletes: Boletus regius

Genus: Butyriboletus

• Genus 2: Boletus

Species: primiregius

• Species 2: regius

Common Name: Red-Capped Butter Bolete

Tells: Oft-pitted/wrinkled cap is usually bright rose- pink to -red. Yellow, oft-bulbous, finely netted stem stains blue. Grows w/mountain conifers in spring.

Other Information: Yellow pores age darker & bruise blue. Yellow cap flesh stains slowly & erratically. The cap sometimes has yellow or brown tones, especially near the margin. The stem sometimes has reddish tints, especially by the base.

Science Notes: Genetic tests have moved the mushroom f/k/a “Boletus regius” to a newly erected genus called “Butyriboletus” (“butyri” being latin for “butter” and this being one of the Butter Boletes); reserved the name “regius” for the European species; and divided the North American version into three separate species. This one (grows w/mountain conifers in spring), Butyriboletus querciiregius (grows w/oak in autumn), & Bu. autumniregius (grows w/mid-elevation mixed woods or conifers, NOT oak, in autumn).

Edibility: Good

CHEMICAL TESTS:

• NH4OH (Ammonia): No data.
• KOH: No data.
• FeSO4 (Iron Salts): Cap surface turns pale purplish. Cap flesh turns grayish.

Links:

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

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