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Observation 143499: Boletus pallidus Frost (Site ID) (Imleria pallida)

When: 2013-08-21

Collection location: Westmoreland Co., Pennsylvania, USA [Click for map]

Who: Hamilton (ham)

Specimen available

Near red oak and white pine growing in moss. Cap 4 cm across, stipe is 2cm thick at the thickest point. Pores are angular, becoming more circular towards the margin. Pore surface bruises a faint olive color, I guess you’d call it. Context of the cap and stipe is white and unchanging, though greyish in the context of the very base. Odor is mild, taste is mild.


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Recognized by sight

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Add Comment
By: Martin Livezey (MLivezey)
2013-08-23 19:55:37 CDT (-0400)

Well stated. Come to my mycology lab this fall at NIH!

To be fair, it may be an exaggeration to say that none of the sequences come from the east…, Clark University is in the East afterall.

By: I. G. Safonov (IGSafonov)
2013-08-22 23:37:13 CDT (-0400)

Great comment/joke, Martin. This reminds me of an old Indian tale I read as a child about several blind men trying to describe how an elephant looks like by touching different parts of his anatomy (presumably the delicate body parts were beyond the grasp of the “researchers”). :) Apart from the 9 useless sequences, not only we don’t know if we are dealing with the same species of the “elephant”, but we also don’t know whether the 3 sequences of the same genetic “fingerprint” region are actually matching. Equally disturbing is your discovery that none of the 12 tested samples come from our neck of the woods — that’s right, based on this “evidence” B. pallidus doesn’t grow in the Northeast. :) Seems like all this research was conducted by the formula “blind leading the blind”.

Just for grins
By: Martin Livezey (MLivezey)
2013-08-22 21:07:57 CDT (-0400)

and to obfuscate things further, I checked GenBank for B. pallidus.

There are 12 submitted sequences for this ‘organism’, not that there is a picture or other morphological data to go with the submissions. Most of the submissions come from people we know. 3 come from the folks in Berkley, 1 from University of Madison, 5 from Clark University, 2 from Kew Gardens in London, and 1 from others we know in Chicago. Of the 12 submissions, there are 10 different regions sequenced (discounting overlaps), so if the 3 of us were to start a sequencing project and agree on a region to focus on, we would, at best have 3 existing records to compare with. And if that was done, how many would be needed for a representative sample of the population in the East? …and by the way, none of these are from the East….,

I.G. & Martin,
By: Hamilton (ham)
2013-08-22 16:42:11 CDT (-0400)

I see what you guys are saying, there is some similarity. In all the Boletus pallidus I have found there was a much stronger bluing reaction on the pores, this was just ever so faint brown with a touch of light green, and it was back to yellow in a couple hours. No sign of bluing or pinkish in the context at all.

I’ll give it a could be for now.

I agree with Martin
By: I. G. Safonov (IGSafonov)
2013-08-22 14:32:23 CDT (-0400)

Everything about this bolete points in the direction of B. pallidus.

By: Martin Livezey (MLivezey)
2013-08-22 14:18:21 CDT (-0400)

Let’s see: pale tan or white cap, check. pale yellow pores with green cast, check. White or nearly white stipe, check. The stains on the stipe do indeed look distinctive and the shape is unusually compact, attractive. What is the most distinctive feature that could not be B. pallidus? Would you call this pallidus?

or these?

By: Hamilton (ham)
2013-08-21 21:22:56 CDT (-0400)

This really doesn’t act or look much like Boletus pallidus. Maybe you made a mistake on the link?

What about
By: Martin Livezey (MLivezey)
2013-08-21 21:16:20 CDT (-0400)

and your other similar one at the same time?