Observation 321391: Baorangia bicolor group

This is the same park where observation 243818 came from but I am not at all sure it is the same species. The main distinguishing features are forming the red on the stipe in a different way (this is spotted and that is streaked) and certain differences in the chemical tests. Whether the same or different the red-and-yellow boletes found in this location have a common name around Pittsburgh courtesy of John Plischke III: “That weird Pine Ridge Bicolor.” It’s just… different from ones found elsewhere.

Notable for this find include (a) forming it’s red stipe from dots and spots seen here; (b) slowly bruising green on the stipe when rubbed; © being known as a sickener, with at least one confirmed victim for this spotted-stalk version; and (d) having a cap that seems to turn red indifferently or not at all. With regard to the last, this observation includes a pair of babies growing mere inches apart, one of which has a full red cap and the other a straight tan cap. Neither was covered or had any other observable differences in their environment. Continuing, (e) the specimens tend to appear in great numbers when they come up, and (f) they reach unusual size compared to most bicolors I have seen. The largest, uncollectably old specimen I found this time had a cap that was almost 10” across.

These are a typical bolete when it comes to texture, odor, taste, and heft. They get quite marshmallowy in old age but otherwise have average firmness.

No particular odor or taste was noted.

Found in grass between oak trees about 10-20 feet into the woods alongside a mowed clearing. The weather has been moderately rainy but the ground underfoot was not wet.

Mycelium was white.

Cap flesh was pale yellow, approaching white in the caps. Larval tunnels were dark red. The flesh did not turn blue in any notable way.

Thin pore layer was yellow, bruised blue/black after about 5-10 seconds, and maintained the dark color several hours later. Older specimens may have bruised a bit more readily than younger ones.

NOTE ON PHOTOS: All chemical tests go in the order ammonia, then KOH, then FeSO4 moving from left to right

Ammonia on Red Cap Skin: Faded to yellow/tan.
Ammonia on Tan Cap Skin: No strong reaction.
Ammonia on Stipe Skin: No strong reaction.
Ammonia on Young Pores: No reaction, or possibly a little darker yellow.
Ammonia on Old Pores: No reaction.
Ammonia on Cap Context: Turned pale pink. (Observation 243818 had no reaction).
Ammonia on Stipe Context: Turned pale pink. (Observation 243818 had no reaction).
KOH on Red Cap Skin: Turned yellow. (Observation 243818 turned orange).
KOH on Tan Cap Skin: No strong reaction. (Observation 243818 turned orange).
KOH on Stipe Skin: Turned red. (Observation 243818 turned faint yellow orange).
KOH on Young Pores: Turned orange.
KOH on Old Pores: Turned red/orange.
KOH on Cap Context: Turned orange.
KOH on Stipe Context: Turned orange.
FeSO4 on Red Cap Skin: Turned olive.
FeSO4 on Tan Cap Skin: Turned olive.
FeSO4 on Stipe Skin: Turned olive.
FeSO4 on Young Pores: Turned olive brown.
FeSO4 on Old Pores: Turned black.
FeSO4 on Cap Context: Turned olive.
FeSO4 on Stipe Context: Turned olive.


Note the stipe spotting red rather than streaks, and the green bruising where it was rubbed with a finger.
Note the half red, half tan cap. This was typical and is not an indication of age or condition.
Pores bruis very dark, but not rapidly. Context did not turn blue.
Older pores bruise a bit quicker. All but black!
Almost no red on this specimen.
Cap flesh barely blues if it does at all. This could easily be a stain carried over from cutting through the tubes.
Young specimen with a tan/yellow cap, found inches away from the one with a red cap.
Young specimen with a red cap.
Closeup on the pores. Gotta love that new macro lens!
Another half red, half tan cap.
White mycelium
Larval tunnels
Closeup on the bruise to the stipe.

Proposed Names

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Recognized by sight

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Add Comment
I plan to
By: Scott Pavelle (Scott Pavelle)
2018-07-05 08:10:09 PDT (-0700)

Hence the careful study and recording of all features. I strongly suspect that this will be one of the “different” results, and thus is extra valuable.

Scott, did you…
By: Dave W (Dave W)
2018-07-04 05:13:10 PDT (-0700)

send any of this to Arian Farid?

This obsie…
By: I. G. Safonov (IGSafonov)
2018-07-03 20:50:52 PDT (-0700)

…reminds me of Dario Z’s obs 242860. Dario is by far the most prolific observer of B. bicolor and B. pallidoroseus on MO.

Ages range from babies all the way to post mature
By: Scott Pavelle (Scott Pavelle)
2018-07-03 19:51:38 PDT (-0700)

The spotted stipes are there even in the little mini ones if you look. This observation includes the full range of ages, and I left the one that was falling apart old behind.

I’m afraid it’s weird all on its’ own without any excuses.

These mushrooms appear to be post-mature.
By: Dave W (Dave W)
2018-07-03 16:34:48 PDT (-0700)

So, I’d question basing a species ID on morphology. Chemical reactions? I tend to work from the initial standpoint of morphology, and… “when in doubt, throw it out” (or preserve it for study).

I would consider genus Lanmaoa for these mushrooms, or maybe Boletus miniato pallescens. The really dark blue bruising on the pores points away from bicolor.

“Weird pine ridge bolete”… interesting. Has material been included in any study?

Created: 2018-06-30 15:51:12 PDT (-0700)
Last modified: 2018-07-05 08:10:11 PDT (-0700)
Viewed: 155 times, last viewed: 2019-08-02 15:27:00 PDT (-0700)
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