Observation 244978: Caloboletus Vizzini

Growing under beech, sugar maple, elm, shagbark hickory and red oak. Bitter taste. Indistinct smell. All surfaces except for cap surface (might have been too dark brown to notice) strongly staining blue and gradually fading. Stem with very faint reticulation. White basal mycelium. KOH staining cap light brown, context yellowish brown. Context staining pale greenish-yellow with FeSO4.

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Proposed Names

3% (2)
Used references: Boletes of North America
31% (2)
Recognized by sight

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Weak reticulation present.
By: Django Grootmyers (heelsplitter)
2016-07-22 01:57:28 CDT (-0400)

It was most pronounced at the top of the stem. This is also a feature of C. calopus and B. roseipes too though. It keyed out to B. calopus var. calopus in North American Boletes, although I doubt that’s really what this is as well. The cap seems a bit dark for C. inedulis. The chemical tests were a better match for B. calopus var. calopus than C. roseipes although it does look pretty close.

It could be
By: Robert(the 3 foragers) (the3foragers)
2016-07-21 22:43:47 CDT (-0400)

Caloboletus inedulis. Do you remember if there where any recirculation at the apex?
I think I can see some.

Very cool collection
By: I. G. Safonov (IGSafonov)
2016-07-21 13:35:58 CDT (-0400)

I believe the occurrence of this European species in NA is very questionable. This is in agreement with the fact that there are no MO obsies from the USA. Besides, the cap color seen in this post (brown) is too dark for the taxon. Chances are it’s an undescribed Caloboletus sp. It’s nice you preserved this collection, Django.

That’s what I thought this was at first
By: Django Grootmyers (heelsplitter)
2016-07-21 11:55:59 CDT (-0400)

and why I didn’t get shots in situ, but the strong bitter taste made me doubt that.

looks very similar to Cyanoboletus pulverulentus..
By: Bill (boletebill)
2016-07-21 06:49:35 CDT (-0400)

…as they appear up here in CT.