Identifying Your Bolete
6.23
RED-STEMMED BITTER BOLETE
Caloboletus roseipes, Boletus roseipes
Frequency
Rare
Habitat Area
Under spruces and hemlock.
Cap
Brown, brown-green to olive gray, sometimes cracked in old age.
Turns pale blue when bruised.
Margin
With a narrow band of sterile tissue.
Tubes
Adnate, depressed near the stalk.
Pores and Pore Surface
Pore surface pale yellow becoming olive-yellow to brownish-yellow in age, blueing when bruised; pores circular, 1-3 per mm.
Stalk
Equal, widened or tapered downward.
Stalk Feature
Yellow towards the apex, lower red rose; sometimes reddish almost to the length. Slightly blue when bruised.
Flesh
Complete change of color to blue (sometimes slow and not very intense). Bitter taste.
Chemical reactions
CAP-STIPE: intense orange red with KOH on the cap and brown on the stipe; orange on the cap and black on the stipe with NaOH; gray with FeSO4; pale beige with NH4OH on the cap and gray on the stipe with NH4OH.
FLESH: to beige with KOH and NaOH; to gray with phenol and formalin; little reaction with FeSO4 and NH4OH.
TUBES: dark brown with KOH, NaOH and NH4OH.
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