Observation 208401: Boletaceae Chevall.

When: 2015-06-30

Collection location: Greensburg, Pennsylvania, USA [Click for map]

Who: John Plischke (John Plischke)

No specimen available

Proposed Names

28% (1)
Recognized by sight
28% (1)
Recognized by sight: Caloboletus cf. calopus, anyone? :D

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Mildly bitter and chemical test
By: John Plischke (John Plischke)
2015-07-01 21:47:44 PDT (-0700)

Koh makes the flesh orangish, nothing to cap. Ferrous sulfate makes the cap green, nothing to the flesh. Ammonia negative to flesh and cap. I just cam back from getting fresh ones. Mine were a little old. After tasting the second one it is definitely bitter but more mild bitter rather than strong.

mildly bitter tasting after a minute or so
By: John Plischke (John Plischke)
2015-07-01 21:41:47 PDT (-0700)

mildly bitter tasting after a minute or so. Chemical testing now.

Smith & Thiers
By: I. G. Safonov (IGSafonov)
2015-07-01 21:25:46 PDT (-0700)

I had a good laugh after reading the following passage from the observation section in the description of C. calopus in their The Boletes of Michigan, p. 322.
“This species is one of the most easily identified of all boletes if one has a microscope and Melzer’s reagent. We have noted in many boletes that the septa of the hyphae in the tube trama were more refractive than the side walls, but this is one of the few species that we know in which the septa are violet in iodine and hence stand out prominently in Melzer’s mounts…”

John, break out that microscope of yours. Forget about Melzer’s – Lugol’s should probably do just fine. :-)

Isn’t this species very common in the West?

did this
By: Noah Siegel (Noah)
2015-07-01 21:16:29 PDT (-0700)

taste bitter?

pore color
By: John Plischke (John Plischke)
2015-07-01 21:12:04 PDT (-0700)

the pore color does seem to be off. I checked online and in the book and the orange seems to be missing. It does seem close.

Not that I’ve see calopus more than once or twice.
By: Dave W (Dave W)
2015-07-01 21:05:21 PDT (-0700)

But the red reticulations do remind me of what I once IDed as such.

By: John Plischke (John Plischke)
2015-07-01 21:03:15 PDT (-0700)

After looking at the photos at and the variation in them at the link below I agree. Thank you. When looking at the bolete book I discounted it because of the cap color. I saw this once before in Idaho. I post an image I took there back in 2008.


By: I. G. Safonov (IGSafonov)
2015-07-01 20:59:17 PDT (-0700)

I thought about that one, but the colors of the pore surface (at maturity) and stipe/reticulation seem to be off… You could be right after all, Dave. I am not familiar at all with this species — I think I’ve seen it only once!

How about Boletus calopus?
By: Dave W (Dave W)
2015-07-01 20:44:49 PDT (-0700)

Maybe some faded ones?

By: John Plischke (John Plischke)
2015-07-01 20:22:28 PDT (-0700)

I have 2 fresh ones and 3 dried ones for me to work on, I only keep most of my dried ones for about a year or until I have a chance to look at it under the scope for a more detailed study. So far the sequencing is only being done from some of the club walks and a lot from the foray. It was not found on club walk so no sequencing. I wish it could be. I will have to lead a walk there next year for the club that way it can be done if it comes up again.

Collection saved for sequencing?
By: I. G. Safonov (IGSafonov)
2015-07-01 20:08:47 PDT (-0700)
By: John Plischke (John Plischke)
2015-07-01 20:04:01 PDT (-0700)

I used the BRB keys yesterday. The pores on the young ones looked mostly yellow maybe with a hint of orange but more yellow or mostly yellow. So I used yellow in the key. No luck, then went back and used orange pores with no luck. I was gust looking at every photo tonight and still have the book in front of me and could not find anything close by photo matching. I agree I can not seem to find it in BRB. It was growing under oak. I have another bolete or so to post tonight and was trying to figure them out tonight also. So far a great year for boletes near me. Let it keep raining every week as long as the mushrooms are this good.

Interesting find, John
By: I. G. Safonov (IGSafonov)
2015-07-01 19:37:56 PDT (-0700)

This one is a head-scratcher. Not in BRB. A combination of the yellow pore surface when young and red reticulation is very unusual. Doesn’t really fit either subsect. Calopodi or subsect. Luridi in the sense of Smith & Thiers — it’s more like a mix of the two.

Created: 2015-07-01 17:24:32 PDT (-0700)
Last modified: 2015-07-01 21:49:59 PDT (-0700)
Viewed: 97 times, last viewed: 2017-06-20 05:56:54 PDT (-0700)
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