Observation 48962: Baorangia bicolor (Kuntze) G. Wu, Halling & Zhu L. Yang

When: 2010-07-22

Collection location: Nehantic State Forest, Lyme, Connecticut, USA [Click for map]

Who: Bill (boletebill)

No specimen available

Typical flush of Boletus bicolor for CT oak/beech woods. They’ve only been up a couple of days but already full of fungus gnat larvae.

[admin – Sat Aug 14 02:03:40 +0000 2010]: Changed location name from ‘Nehantic State Forest, Lyme CT’ to ‘Nehantic State Forest, Lyme, Connecticut, USA

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


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The Singer characterization
By: Dave W (Dave W)
2012-02-04 20:08:28 PST (-0800)

doesn’t seem to fit bicolor.

Thanks for the explanation, Bill. So the current “understanding” of the bicolor boletes — whatever that means — appears to challenge the nomenclature? Now I feel a little better about the several confusingly different red and yellow boletes that I find around here.

Thanks for the tip about latex affecting the staining reaction. I make pot collections of the hygrophoroides and volemus. So I should be careful with cross – handling.

bicolor is a mess…
By: Noah Siegel (Noah)
2012-02-04 17:46:35 PST (-0800)

I have no idea what is going on with them, what is the “real” _Boletus bicolor, is there even a real bicolor

This is from Singer’s Agaricales In Modern Taxonomy
Mycologia 36: 358. 1944.
Type species: Boletus spinifer Pat. & Baker.
Characters: Pileus with a subepithelial or trichodermial-palisadic epicutis; pores
small and much like those Boletus, at first white or whitish, adnate to deeply depressed
around the stipe; hymenophoral trama of the Boletus-subtype; spores pale
cinnamon pink or pale ochraceous cream (Corner), i.e. print colored as in
Tylopilus; spores inamyloid, small (less than 8 /um long) and ellipsoid (Q less than 2,
mostly ± 1.5); cystidia few, mostly in the form of pseudocystidia without contents,
but pseudocystidia numerous and when mature becoming distinctly coscinoid, the
walls thin to irregularly thickened becoming bistratous and 0.5-1.5 /um thick, clavate
and ventricose to awl shaped, pigmented (dark ferruginous, olive, fulvous brown,
or melleous), metachromatic in toluidin blue and cresyl blue (external wall – blue,
internal walls red); stipe variable in shape, often attenuated downwards or bulbous,
neither scabrous nor reticulate but slightly pruinose to scurfy, central, solid.
Context ± bitter; hyphae without clamp connections, moderately and late gelatinizing
(carpophores of the slow-growing, long-lived type).
Development of the carpophores: Gymnocarpous (?), cf. Corner (1972) p. 173, 32;
Singer (1981), p. 284-285; Watling (1985).
Area: Paleotropical.
Limits: The genus is related to Xanthoconium and Tylopilus but differs from both
in spore and cystidial characters. The ± bitter taste, slow development and paleotropical
distribution are also characteristic.
State of knowledge: Only two species are known at present.
Practical importance: Not known. Ectomycorrhizal relationships not yet demonstrated.
B. spinifer (Pat. & Baker) Sing.; B. bicolor (Mass.) Sing.*
*c.n. ( = Boletus bicolor Mass., Kew Bull, for 1909:205. 1909 non al.).”

he isn’t describing our bicolor is this…

Here is the blue staining from Lactarius volemus latex that Bill mentioned:

The middle two boletes are Boletus rubropunctus, not a blue staining bolete under normal circumstances. the other two are B. bicolor which all parts has a nice reaction to the latex. I have a whole bunch more, you get all different reactions from other species.

B. bicolor, species cluster or polymorphic single?
By: Bill (boletebill)
2012-02-04 17:09:03 PST (-0800)

I guess this is where molecular taxonomy can answer questions a macro taxonomist can’t. from my point of view it’s difficult to tell of the B. bicolor group is a cluster of look-alikes and distinct cryptic species or contrary-wise an extremely polymorphic species, that is a single (or many a few) species that expresses it’s phenotype in various forms. probably Roy Halling or Manfred Binder could give us some current thinking but for myself I don’t know. I do know from my own experience the blue reaction of the stipe and pore mouths has to do with the age, density and moisture content of the mushrooms. Young, fresh moisture laden B. bicolor almost always blue on the stipe. Older, less dense, drier B. bicolor don’t blue on the stipe. Interestingly B. bicolor that are wet with morning dew or from a fresh rain also often blue on the stipe and I’ve always assumed this had to do with PH of the rainwater or dew. I think most of the east coast crowd know the story of Noah and I picking Lactarius corrugis and boletes in CT and Noah discovering that the latex from these Lactarius ON YOUR HANDS turns a whole BUNCH of different boletes blue on the stipe and the flesh. that’s another story.

By: walt sturgeon (Mycowalt)
2012-02-04 13:24:12 PST (-0800)
Sorry to butt in…
By: Dave W (Dave W)
2012-02-04 11:24:13 PST (-0800)

but the question “What is Boletus bicolor?” has caused a fair amount of confusion for me. This collection shows a stronger bruising reaction on the pores than I am used to seeing here in NE PA.

Is this to say that the “Boletus” bicolor complex is best viewed as a separate genus of subtley different species? I have noted interesting macro traits in the local varieties… sometimes seeming to vary seasonally. For instance, what I call B. bicolor — found in association with a fairly wide variety of tree types, but most prominently mixes of White Pine and oak — often bruises very dark blue (almost black) on the stipe.

By: walt sturgeon (Mycowalt)
2012-02-04 07:32:07 PST (-0800)

Your questioning is right on the mark. I picked your photo to suggest the new name, expecting to get a response from you and hopefully getting some answers from others. I think you are aware that I think there are B. bicolor impostors in the Appalachians and even the “real” one probably differs significantly from material on other continents.

OK I think I understand..
By: Bill (boletebill)
2012-02-04 06:45:03 PST (-0800)

…from what I see Boletus bicolor and it’s potential vatieties are the only North American taxa that fit in Boletochaete even though the Hibbert analysis is from Asian bicolor. So as far as i can see the main distingishing character for this circumscription is numerous setae-like cystidia (pseudocystidia?) on the gills. has anyone looked at the gills of B. bicolor from NA collections? I know I haven’t but I’m curiuos. And is the collection that Singer uses in 1986 to describe B. bicolor as Boletochaete from European material, Asian or where? Maybe one of the bolete experts can lead me here to some info on this?

I am glad they agree with you
By: Martin Livezey (MLivezey)
2012-02-03 18:03:47 PST (-0800)

Here is a link from IF


on the 1986 name…,

Not sure I ate these
By: Bill (boletebill)
2012-02-03 16:47:27 PST (-0800)

…but since I eat 100’s of these most years and dry 100’s more it’s possible I did one or the other with these. this is the most common bolete in CT. I’m not sure why the generic re-assignment is applied here I only know of the Boletochaetae from Binder’s list of segragate genera and the reference to the old Singer genus for some Asian or South American boletes. I’m assuming someone did some molecular work on B. bicolor and it fits there? I dunno. Walt is probably up to date on this.

Beautiful collection Bill,
By: Martin Livezey (MLivezey)
2012-02-03 10:32:13 PST (-0800)

Were those consumed?

gnats bat last! ;)
By: Debbie Viess (amanitarita)
2010-07-24 09:03:02 PDT (-0700)

you are a brave man, Bill, to hunt the woods in Lyme CT, ground zero for Lyme disease!

Created: 2010-07-22 20:29:21 PDT (-0700)
Last modified: 2016-07-22 17:14:12 PDT (-0700)
Viewed: 734 times, last viewed: 2018-03-05 15:18:06 PST (-0800)
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