Boletus subcaerulescens (E.A. Dick & Snell) Both, A.E. Bessette & A.R. Bessette
This bolete was originally described as a subspecies of Boletus edulis, although it was recently (and justifiably) raised to specific status. It is closely related to Boletus pinophilus and allied boletes that appear to have a strict association with conifers, particularly pines. It is easily recognized by the bluing reaction that occurs when the tubes are bruised (see photo below). This bolete was recorded from Minnesota for the first time in 2004.

cap surface in 5% KOH; 125x

cap surface in 5% KOH; 500x

laticiferous hypha in cap context (5% KOH); 500x

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