Observation 47773: Boletus L.

When: 2010-06-28

Collection location: Jamieson Park, Poynette, Wisconsin, USA [Click for map]

Who: Steve Nelsen (sfnelsen)

No specimen available

Boletus sp., Section Subtomentosi, Subsection Fraterni in Smith’s classification. Persistently pink caps, strongly blueing, yellow pores at first. A smaller of the caps that I brought home was 5.5 × 4.5 cm, others bigger, stems 5.5 x.7, reddish bruising blueish flesh yellow. NaOH on cap yellow, on flesh orangey, FeCl3 on cap greeen, on flesh green. NH3 on cap yellowish slowly. Spores brown in mass, ~13 × 3.6 microns. There were many of these. I would appreciate a name for these.

[admin – Sat Aug 14 02:01:34 +0000 2010]: Changed location name from ‘Jamieson Park, Poynette, Columbia Co. WI, USA’ to ‘Jamieson Park, Poynette, Wisconsin, USA


Chemical structures of variagatic acid and its red and blue oxidation products.

Proposed Names

81% (1)
Eye3 Eyes3
Used references: Smith, A. H.; Thiers, H. D. Boletes of Michigan, Univ. Michigan: Ann Arbor, 1971.
Based on chemical features: see notes.

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
It’s a complex
By: walt sturgeon (Mycowalt)
2010-07-02 18:13:14 CDT (-0500)

Macroscopically I would call it B. fraternus. But I would not wager nuch on this ID!

FUNGI magazine…
By: Debbie Viess (amanitarita)
2010-06-29 10:10:29 CDT (-0500)

is online here: http://www.fungimag.com/

not all articles are available online. you can subscribe to the mag, tho, and get issues delivered to your home! ;)

how can I get the
By: Johannes Harnisch (Johann Harnisch)
2010-06-28 20:53:10 CDT (-0500)

magazine? is it online?

By: Erin Page Blanchard (CureCat)
2010-06-28 17:42:28 CDT (-0500)

This is great! Thank you once again.

So, are the colour and/or oxidation reaction differences between variegatic acid, Xerocomic acid, and Isoxerocomic acid? It was not clear to me in the image.

Structure of the stuff that makes Boletus species turn blue when you bruise them
By: Steve Nelsen (sfnelsen)
2010-06-28 16:28:30 CDT (-0500)

There was enough interest in the stuff that makes Gyroporus cyanescens blue (which is different from the stuff that blues Boletus and Suillus) that I added a picture of its chemical structure too. This information will appear, with references, in the Summer eddition of Fungi, the Magazine.

Created: 2010-06-28 13:20:28 CDT (-0500)
Last modified: 2010-08-26 20:19:11 CDT (-0500)
Viewed: 171 times, last viewed: 2018-04-22 01:02:10 CDT (-0500)
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