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. (Almost certainly a Caloboletus).
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. Bottom line: this is a Caloboletus, not a Butyriboletus. The morphological arguments could not be clearer; we now know the 1963 sample was actually misidentified; and we even have forager-level DNA testing to confirm the point. Alas, but no one in the ivory tower has published a paper to make these points, and thus we are stuck with using the mistaken name until someone in authority gets around to fixing it. [Sigh]
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.
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