Observation 102587: Boletus L.

3-1/4″ × 1-7/8"
Cap: velvety red-brown

Context: relatively thick, dull white, non staining.

Pore surface: yellow, slowly staining faintly brown, pale olive

Stalk slightly enlarged downward, reddish w/o reticulation to dull brown, staining slowly to watery brown with pale olive tint from handling. Very slowly staining when cut.

Taste: mild, slightly sour, odor unremarkable

Growing in lawn beside wood fence in suburban neighborhood, near large spruce (I think).

No blue staining at all; tiny worm holes stained red

Species Lists


White balanced for incandescent light
Same as above after drying 24 hours
Younger fruit body from same area. I planned to let this grow, but it was broken when I found it. Note red tint under pileipelis, slight blueing at center of stipe, and unremarkable reaction to from left KOH, FeSO4, NH4OH
White balanced for incandescent light

Proposed Names

29% (1)
Eye3 Eyes3
Recognized by sight
-6% (2)
Recognized by sight: The background is… disturbing? At least doing weird thing to the color. Was it pinkish-red?

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
2nd specimen added
By: Martin Livezey (MLivezey)
2012-07-24 18:17:31 PDT (-0700)
Thanks Dave
By: Martin Livezey (MLivezey)
2012-07-24 09:34:16 PDT (-0700)

The overall appearance of both the stipe and pileus was red to red brown; Pileus was rosy red in the center to brown at the margin. Even so, these were taken under incandescent light with a flash. I enhanced mid-range contrast by -20 and I agree, the red is a bit bighter this way, especially with the blue and green in the background. The base of the bulb was contracted to point – not as sharp as B. innixus. By the way, the half I left out last night was completely olivaceous brown, this morning like you see on both edges of the stipe where it was handled. The red was gone. The take away for me given the color variation is the luster /translucency of flecks in the stipe and to some extent, the context. I don’t know if this is consistent or not in other collections.

My own collections of what I have IDed as B. miniato olivaceus…
By: Dave W (Dave W)
2012-07-24 08:04:34 PDT (-0700)

have shown considerable variability with the bluing on the cut context… generally little to virtually none. So I agree with Noah that the bluing on context is not a very reliable character for the spcies. Also, I have observed quite a bit of variation regarding the color of the stipe… completely yellow to partly flushed with pinkish red to almost completely flushed with pinkish red. Looking at some of my old photos, I see a few examples of the reddened insect tunnels in the conetxt.

But something about this obs just doesn’t remind me of B. miniato olivaceus… maybe the shape of the stipe? Most of my collections show a stipe sharply tapered below. Or maybe the overall deepness of the red color seen on this obs?

Most of my collections have been made from the same half mile stretch of trail. At least some of my collections have shown blue-slowly-to-brown on the pores as reported in Bessette.

By: Martin Livezey (MLivezey)
2012-07-24 06:19:30 PDT (-0700)

also closely matches photos in Bolete book. I will try chemical tests on fresh specimen next time.

It rarely blues
By: Noah Siegel (Noah)
2012-07-23 19:33:03 PDT (-0700)

despite what BRB says…

Thanks Noah
By: Martin Livezey (MLivezey)
2012-07-23 18:51:25 PDT (-0700)

Bessette p. 129 suggests blueing when cut; this does not do that.

Macrochemical tests on pileus not conclusive:
KOH: slowly toward yellow, but still looks dark red-brown
NH4OH: almost no reaction.

It was in the refrigerator for about 20 minutes before the tests. There is another button on the way that I will allow to mature if someone else does not get it.

Created: 2012-07-23 18:34:28 PDT (-0700)
Last modified: 2014-06-24 11:20:45 PDT (-0700)
Viewed: 160 times, last viewed: 2017-06-13 06:57:52 PDT (-0700)
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