Observation 110045: Boletaceae Chevall.

When: 2012-09-16

Collection location: Leonard Springs, Bloomington, Indiana, USA [Click for map]

Who: Stephen Russell (Mycota)

Specimen available

Slight blue bruising in context above tubes when sliced.
Pore surface slowly bruises blue. Eventually stains olive.
Insect damage leaves red staining on stem.
Slight pseudoreticulation evident at apex of stem. Only visible with hand lens.

On cap:
NH4 – Reddish purple turning yellow-orange
KOH – Reddish purple turning yellow-orange
FE – Grayish

Narrow band of sterile tissue along margin.

Species Lists



Proposed Names

28% (1)
Recognized by sight
-57% (1)
Recognized by sight
6% (2)
Recognized by sight
32% (3)
Based on chemical features: ITS
-19% (3)
Based on chemical features: ITS1F-ITS4
56% (1)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: I. G. Safonov (IGSafonov)
2016-08-19 10:22:24 CST (+0800)

How long was your ITS sequence and how many base pairs was it off the closest Butyriboletus relative in GenBank? Was it really clustering around other Butter Bolete species in your BLAST search? It doesn’t quite look like a typical Butter Bolete, but to my eye it surely looks even less like B. sensibilis.

Eastern Butyriboletus
By: walt sturgeon (Mycowalt)
2016-08-19 10:17:47 CST (+0800)

Have reticulate stems as far as I know.

What makes you doubtful on Butyriboletus Walt?
By: Stephen Russell (Mycota)
2016-08-19 10:02:31 CST (+0800)

Phylogenetically, this clearly falls out in the Butyriboletus clade…

I am doubtful on B. brunneus.

By: Noah Siegel (Noah)
2013-01-15 13:39:50 CST (+0800)

something like Boletus sensibilis. Or in that group anyway.

Created: 2012-09-17 09:37:17 CST (+0800)
Last modified: 2017-04-26 11:52:20 CST (+0800)
Viewed: 116 times, last viewed: 2018-06-18 01:53:45 CST (+0800)
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