Observation 48864: Mixed collection

When: 2010-07-21

Collection location: Cleveland, Ohio, USA [Click for map]

Who: clevshroom

No specimen available

Found in hardwoods forest near oak.

[admin – Sat Aug 14 01:59:29 +0000 2010]: Changed location name from ‘Cleveland Ohio’ to ‘Cleveland, Ohio, USA



Proposed Names

28% (1)
Recognized by sight

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Eye3 = Observer’s choice
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Add Comment
I see what you mean, IG.
By: Dave W (Dave W)
2012-06-26 07:56:49 CDT (-0400)

My own collection (18471) appears to show one specimen with a small reticulate area near the apex, giving the impression of a mixed collection. But I know that I gathered these boletes from the same small patch.

The staining/bruising on this batch was really prominent.


By: I. G. Safonov (IGSafonov)
2012-06-25 21:26:23 CDT (-0400)

I appreciate your efforts in raising the confidence level for what is perhaps the first such observation on MO. However, without further info from Clevshroom and insight from competent fellow boletogists who frequent this website, we cannot do much but engage in conjecture…

As I mentioned before, this could be a mixed collection due to the presence of smooth stipes, so a single ID proposal is not applicable here.

As support for B. b. var. reticulatus is begginning to run out of steam, the reticulated bolete on the left in the last picture is beginning to look a bit like B. speciosus (yes, I know, B. speciosus should be reticulated at least 1/2 through)…

Also, take a look at your own observation No. 18471 (B. bicolor with strong bluing and a bit of reticulation) and my observation No. 74553 for which you also proposed B. bicolor var. reticulatus. The point being is that there is no shortage of confusing overlap in macroscopic characteristics in this section of genus Boletus that obfuscate rather than help identification…

Agreed. Color does not always translate well via monitor.
By: Dave W (Dave W)
2012-06-25 19:46:17 CDT (-0400)

I have viewed this post several times on each of two different computer monitors.

The collection agrees very well with bicolor var. subreticulatus… I was hoping we could perhaps increase the confidence level for this ID.

And, maybe bicolor var. subreticulatus exhibits an unusual staining/fading pattern which would help to set it apart (as a species) from the other red and yellow boletes. So this is something to keep in mind.

By: I. G. Safonov (IGSafonov)
2012-06-25 15:53:58 CDT (-0400)

The color of the bruising is open to interpretation — after all, it’s a digital photo observed on a computer monitor, and the human eye is not a spectrophotometer. Whether it’s reddish or reddish brown is probably not important considering the proposed ID is only “could be” B. bicolor var. reticulatus. I guess this is as good as it gets…

Yes, I agree about the variability of bluing of bicolor specimens.
By: Dave W (Dave W)
2012-06-25 14:26:23 CDT (-0400)

Some blue only on the pores, some only on the cut context, some most intensely on the stipe, and some almost not at all. These tendencies (by my observations/recollections) vary with location, seasonally, or by year.

I have read a few accounts on this site in which the claim is put forth that bicolor bluing reaction changes over the course of one year’s fruitings.

I’m just wondering about the “fade to reddish” thing. I don’t seem to recall it for bicolor. But maybe I’m just not remembering. I’ll experiment with some of my bicolor collections this year. Should be starting real soon!

By: I. G. Safonov (IGSafonov)
2012-06-25 13:30:58 CDT (-0400)

I don’t remember with certainty. The only two B. bicolor observations I posted do seem to show some brownish dicolorations on the pore surface, but I cannot recall whether there had been a color change from blue to reddish/brown. The bluing action in B. bicolor is highly variable in terms of intensity and speed (some don’t turn blue at all even on the pore surface), so I don’t trust it very much. I pay much more attention to other observable macroscopic charactristics to arrive at an ID…

IG, have you previously seen the blue to reddish/brownish…
By: Dave W (Dave W)
2012-06-25 07:49:29 CDT (-0400)

bruising on another bicolor collection? maybe I’m just not remembering. But I don’t recall this trait for bicolor. I think most of my collections that bruised blue on the pores eventually just faded.

By: I. G. Safonov (IGSafonov)
2012-06-25 01:10:19 CDT (-0400)

Thanks for commenting, Dave.
I think these reddish bruises are old — this shrooms spent some time “socializing” in a basket before being photographed. The pore surface originally stained blue, which is consistent with these boletes, and then eventually turned reddish-brown. In the second photo from above you can see a fresh bluish bruise near the margin at 3 o’clock…

The bruises/stains on the pores look reddish.
By: Dave W (Dave W)
2012-06-24 22:58:06 CDT (-0400)

I don’t know what to make of this? I have seen blue – to – reddish on the pores of some types of red and yellow bloetes… B. miniato olivaceus, for instance. Does this happen with bicolor types? Otherwise, B. bicolor var. subreticulatus looks like a good proposal for this collection.

Having seen
By: I. G. Safonov (IGSafonov)
2012-06-24 14:08:55 CDT (-0400)

enough B. bicolor in the flesh and knowing how its stature and color scheme is different in some regards from other bicolor-like, red-and-yellow bluing boletes, I was about to propose B. bicolor for this collection. However, examination of the last photo showed pronounced reticulation in the two specimens on the left. The other fruitbodies in that photo looked the same, but seem to lack the reticulation. Ergo, it’s possible that the mushrooms belong to different collections. I also think that at least some of these basidiocarps might be varieties of B. bicolor, as judged by the thin tube layer, lack of instant bluing when cut, and the prevalence of red on the stipe.

A stain made by pushing onto the pores
By: Dave W (Dave W)
2010-07-21 15:51:45 CDT (-0400)

is called a bruise. B. campestris would show bluish bruises on the pores. Also, the tiny pores on these fairly mature mushrooms points away from B. campestris. B. campestris has larger pores.

stains of red
By: clevshroom
2010-07-21 14:42:28 CDT (-0400)

those are areas I pushed with my finger, these are very firm boletes with very very small pores, the pore surface seems hard as well.

Boletus campestris
By: Dave W (Dave W)
2010-07-21 12:14:30 CDT (-0400)

is a small thin bolete that bruises bluish on the pore surface. The red stains on the pore surface (seen in this obs) seem pretty interesting to me.

Created: 2010-07-21 10:29:00 CDT (-0400)
Last modified: 2012-09-08 14:50:59 CDT (-0400)
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