Observation 109904: Gastroboletus turbinatus (Snell) A.H. Sm. & Singer var. turbinatus

Original Herbarium Label: Gastroboletus turbinatus (Snell) A.H. Sm. & Singer var. turbinatus
On the trail to Mystic Beach west of Pete Wolfe Creek
SVIMS foray

Species Lists


Photo taken shortly after the cutting
Photo taken ca. 2:30 minutes after the Image # 263110
Photo taken ca. 20 minutes after Image no. 263110
Some of the blue is disappearing and changing to a different hue, obviously because of further oxidation process

Proposed Names

-24% (2)
Recognized by sight: Lack of blue reaction on context of pileus and stipe problematic for G. turbinatus var. turbinatus.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Can’t believe
By: Daniel B. Wheeler (Tuberale)
2012-09-18 00:54:40 CDT (-0400)

I said that. But time for me to eat crow.

Of course Gastroboletus would not have crowded gills.

Crowded gills?
By: Oluna & Adolf Ceska (aceska@telus.net)
2012-09-18 00:43:55 CDT (-0400)

We did not see any gills on our specimens! O&AC

Obs. 10091
By: Daniel B. Wheeler (Tuberale)
2012-09-17 22:05:57 CDT (-0400)

was mine. I named it after receiving a name from the people at OSU Forestry Laboratory, who identified it as G. turbinatus. I too thought the blue should have been stronger.

This obs. looks different from 10091. The crowded gills turn dark blue, while the stipe barely turns blue at all.

According to Dr. James Trappe typical Gastroboletus turbinatus will turn blue so quickly upon exposure to air that it is almost impossible to catch the color change.

For my collections of G. turbinatus outside of 10091, the rapid color change is easy to see and extremely fast: a matter of a second or two at best. The color, once changed, seems to last through the drying process and at least several weeks afterward, at least in my experience.

BTW, obs. 23220, 23105, 10030, 9416, 10029 and 8791 are all from the exact same spot as 10091. The other obs. clearly show that blue reaction after being sliced.

I added another image
By: Oluna & Adolf Ceska (aceska@telus.net)
2012-09-17 17:32:31 CDT (-0400)

I added another image taken shortly after cutting the sporocarps and also added the time scale of the photos. Adolf

What is blue and what is blue enough?
By: Oluna & Adolf Ceska (aceska@telus.net)
2012-09-17 16:47:09 CDT (-0400)

Daniel, Have a look at the MO Observation no. 10091! We cannot help it, but it seems to us that our cut fungus is bluer than that on MO # 10091, whoever did that one :-). O&AC

Not G. turbinatus var. turbinatus I think.
By: Daniel B. Wheeler (Tuberale)
2012-09-17 16:05:05 CDT (-0400)

Certainly Gastroboletus, though. Possibly an unnamed species.

Gastroboletus turbinatus var. turbinatus when cut through the stipe turns blue on all cut surfaces nearly instantly. I have tried to document this on film, but by the time I focus and shoot the reaction is nearly complete. Your cut stipe shows almost no blue reaction to air.

Created: 2012-09-16 16:57:09 CDT (-0400)
Last modified: 2012-09-18 01:25:11 CDT (-0400)
Viewed: 170 times, last viewed: 2017-06-14 03:05:57 CDT (-0400)
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