Observation 171333: Baorangia bicolor group

When: 2014-07-27

Collection location: York Co., Maine, USA [Click for map]

Who: Erlon (Herbert Baker)

No specimen available

Proposed Names

-46% (4)
Used references: Arora, Mushrooms Demystified.
-54% (4)
Used references: Arora, Mushrooms Demystified.
38% (5)
Recognized by sight
58% (1)
Eye3 Eyes3
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I.G. -
By: Daniel B. Wheeler (Tuberale)
2014-07-28 01:42:51 PDT (-0700)

Your “clearly visible” looks barely visible to me … but I see what could be interpreted as Hypomyces infection. It might also regular spore germination.

I have looked at the photo, and see no “yellow flesh”. Green staining on upper stipe, and some on tube surface. And brown staining, perhaps from handling.

I disagree this is an “old basidiocarp”. This basidiocarp is not planar yet. The cap edges remain in-curved. From the look of the stipe and pore predation I suspect it is unlikely to reach “old” age.

Apparent Hypomyces infection…
By: I. G. Safonov (IGSafonov)
2014-07-27 21:53:26 PDT (-0700)

… clearly visible on the pore surface/tubes. It’s in a nascent stage. White flesh is unusual for B. bicolor, but could still happen in an old basidiocarp for whatever reason. I can see yellow flesh on the stipe near the cap junction in the second photo. I would bet that the context of the young mushroom is of the same color, i.e. yellow, — the way it’s supposed to be for the two-color bolete.

Yellow-staining cap context
By: Daniel B. Wheeler (Tuberale)
2014-07-27 21:22:01 PDT (-0700)

not present. In photos identified here on MO, that is a feature that IS NOT consistent, and probably needs to be addressed.

I see no indication of Hypomyces infection. Such infection would show abundant mycelium, which is not present here.

I do see considerable predation on the stipe by animal mycophagy. There is no indication on the stipe of yellowing, either. It is curious to me that so much of the hymenium has been consumed, as well as so much of the stipe. Perhaps animal mycophagy is an important element in the dispersal of this fungus?

Dave W: I did not comment on the cap color, only the cap flesh color. I looked on MO for obs. relating to B. bicolor before posting this, and was underwhelmed and unconvinced by some of the obs.

I wonder if…
By: I. G. Safonov (IGSafonov)
2014-07-27 20:26:15 PDT (-0700)

… the flesh color and consistency was altered by the hypomyces infection. Note how marshmallowy the flesh texture is…

Large post-mature specimens…
By: Dave W (Dave W)
2014-07-27 18:29:16 PDT (-0700)

of B. bicolor often lose the rosy cap color. Aerolate cap surface is typical with these.

I’d bet $20 (my personal limit) this obs does not represent a species of Suillus.

Last photo shows what appears to be white internal cap context, which is seemingly troubling to the B. bicolor proposal. But many of my own photos of sectioned bicolor fail to accurately show the yellow color of the context. It often comes out looking white.

Mr. Wheeler,
By: I. G. Safonov (IGSafonov)
2014-07-27 14:59:26 PDT (-0700)

I would call the young mushroom B. bicolor… The bottom line is that the pictured mushrooms have all the hallmarks consistent with the Boletus bicolor group and none of those being Suillus spraguei or any other Suillus sp. I suggest you take a look at other MO observations of the two boletes to convince yourself of this. North American Boletes by Bessette-Roody-Bessete is a great reference to have…

In which photo
By: Daniel B. Wheeler (Tuberale)
2014-07-27 10:49:27 PDT (-0700)

do you see what Arora calls “pale yellow, blueing erratically and often slowly” cap flesh? I see only white flesh in the cracks of the cap, as well as the sliced cap.

Was this associated with White pine, Herbert?
By: Daniel B. Wheeler (Tuberale)
2014-07-27 10:24:12 PDT (-0700)

Suillus pictus (now S. spraguei) seems a good fit, but is found with White pine. I see nothing about the nearby trees for this observation. Boletaceae are mycorrhizal. Knowing the nearby trees helps sometimes with identification.

Created: 2014-07-27 09:52:20 PDT (-0700)
Last modified: 2016-07-29 14:51:12 PDT (-0700)
Viewed: 83 times, last viewed: 2017-06-18 10:18:59 PDT (-0700)
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