Observation 142248: Boletus bicolor group

When: 2013-08-10

Collection location: Grafton, Massachusetts, USA [Click for map]

Who: Fabrizio Bordo (fbordo)

Specimen available

These two specimens were found in Grafton, Ma on mixed woods (white pines, oaks and birch nearby) on 08-09-2013
Pileus is 2 ½” wide with a variety of colors from reddish pink to light brown, to light olive brown, with minute beginning of cracking on the pileipellis. The contex is pale yellow did not stain after cutting and bruising.
Spore surface is deep yellow fading greenish/olive towards the margins, and bluing fairly quickly when bruised.
Stipe is 2 ¾” long nearly equal pale yellow towards the apex, brownish in the center and red to purple /burgundy red towards the base, reticulation is absent.
Spore print is poor , but olive brown
Chemical reaction: pileipellis, stipe and stipe flesh is blackish on FESO4, Pileus contex graysh olive/pink on FESO4. Negative on KOH except stipe surface turning rusty brown.
Spores: Eliptical, smooth somehow subsiform 12.04X4.53 um.
With all theese information I should have being able to nailed it,…but not quite yet…My guess is some form of bicolor B., or maybe Boletellus intermedius, however neither of them are fitting perfectly

Proposed Names

48% (1)
Eye3 Eyes3
Recognized by sight: Bicolor bolete type
Used references: NA Boletes (Bessette)
Based on microscopic features: 12.04X4.53 um
Based on chemical features: KOH, Iron S. Lugol

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2013-08-10 16:43:11 CDT (-0400)
Last modified: 2013-08-10 16:43:13 CDT (-0400)
Viewed: 21 times, last viewed: 2017-06-16 10:18:37 CDT (-0400)
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