Observation 212975: Boletus separans Peck
When: 2015-08-16
No herbarium specimen

Notes: Dry, old fruit body under red pine, oak, sweet gum, holly forest. Growing in pine duff near lake. Unusual campanulate cap with coppery luster and pale to pale blue margin, cap context very thin, pore layer very thick, hymenium deeply recessed around stipe, stipe relatively thin, pale to white at top becoming dark purple or purple red at base. Aroma very rich, positive, mushroomy. If it was not full of worms, I would have thought it an edible. Context of cap and stipe white and probably due to age, very weakly staining. Color of pale blue and yellow can be seen in photo 3.

Species Lists


Not modified for additional contrast by Gimp
Not modified for additional contrast by Gimp

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Recognized by sight
53% (3)
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No, there was no bluing, pure white
By: Martin Livezey (MLivezey)
2015-08-18 10:01:50 EDT (-0400)

just like a good edible.

Cut the Gimp loose!
By: I. G. Safonov (IGSafonov)
2015-08-17 20:34:37 EDT (-0400)

The un-gimped pix still have the bluish tint, Martin, just less of it. Looks like it’s a digital photography artifact.
The question remains: did the context look blue to you when you cut the mushroom in half? That’s the only thing that matters.

Please take a look
By: Martin Livezey (MLivezey)
2015-08-17 19:51:09 EDT (-0400)

at the last two photos in which I did not enhance the contrast slightly with Gimp. They are not as blue; maybe in your eyes no blue. You have to believe I did not do this out of a sense of mischief! B. separans it is!

Identification difficulties
By: I. G. Safonov (IGSafonov)
2015-08-17 15:24:40 EDT (-0400)

This old and battered bolete is sending mixed signals. The elements did a number to this poor thing, but one would think that analysis of the extant morphology visible in the pix (good documentation, Martin) should to be enough for a conclusive ID. The bluing is the only thing that works against B. separans. All the other attributes, however, including the absence of reticulation, the pleasant odor and the habitat, are for the most part in line with B. separans. Chemical tests would have been helpful here, too. Notable developmental oddities, like the tubes growing directly from under the pileipellis tissue and the “embroidery” above the cap margin can be explained by old age and harsh weather conditions.
The real question is why would the flesh blue, but not the tubes? So, Martin, is the bluing a real thing, or is it just an artifact of digital photography?
Fresher fruiting bodies and different stages of development should put this mystery to rest. In light of the unfavorable weather pattern and lateness of the season, we probably need to wait till 2016. :)

If it’s not actual blue stain…
By: Dave W (Dave W)
2015-08-17 14:40:05 EDT (-0400)

then this really looks like separans to me.

Thanks Dave
By: Martin Livezey (MLivezey)
2015-08-17 12:43:28 EDT (-0400)

As I mentioned below, the blue was not as apparent in life as in the photos. Perhaps an artifact under blue sky? The photos were also given a bit of contrast by Gimp. I will post completely unmodified photos of same.

IMO, the most interesting/useful feature here…
By: Dave W (Dave W)
2015-08-17 10:54:32 EDT (-0400)

is the blue staining on the context.

Almost definitely not any Tylopilus species, based on color of tubes and blue stain.

Except for the blue staining, this looks like B. separans. I have found fruitings of B. separans that include variably reticulate stipes, including ones with no reticulation at all. But the blue staining on the context eliminates this species from consideration.

By: Martin Livezey (MLivezey)
2015-08-17 10:33:08 EDT (-0400)

Good questions. I am very familiar with T. plumbeoviolaceus; it is quite common here, certainly our favorite Tylopilus. The brown cap and purple stipe are the right colors in the right places, but the pore layer is normally white to pink to dirty gray, not the yellow / green we see here. Your response to the photo of the appressed pores near the stipe is just like my own – photos lie! The recessed pore layer just does not appear. But the section shows it the way it really was. By the way, we had a club member the other day say that T. plumbeoviolaceus is a fine edible – if you boil it quite a while before you do whatever else that you are going to do. Everyone shook their heads, but maybe it is a good edible with the right prep. Here is a photo of what I think of as typical.


Tylopilus plumbeoviolaceus?
By: Daniel B. Wheeler (Tuberale)
2015-08-17 01:27:37 EDT (-0400)

Has anyone else noticed this particular color within this specific species recently?

Stipe coloration
By: Daniel B. Wheeler (Tuberale)
2015-08-17 01:13:05 EDT (-0400)

looks plum-colored to me, Martin. Boletales are mostly mycorrhizal. Unfamiliar with Maryland fungi.

One other thing I notice: the tubes do not appear appressed to the stipe in the uncut photo; yet in the cross-section photos, the tubes appear appressed. What’s up with that?

…and what about the lack of
By: Martin Livezey (MLivezey)
2015-08-16 21:32:08 EDT (-0400)

a context in the cap? Is that typical of an old fb in a dry spell? Those tubes are also unusually long…, And then there is the completely unoffensive, almost attractive smell. I admit that trying to identify this is probably a lost cause due to the age and lack of comparable examples at the site. How about the general presentation with the embroidery / constriction right above the margin and the very prominent margin? I will try to visit there again.

No, I don’t think so…
By: I. G. Safonov (IGSafonov)
2015-08-16 21:17:51 EDT (-0400)

… and that’s reflected in my level of confidence (doubtful). Of course, total lack of reticulation and bluing of the context eliminates B. separans. And yet, this Boletus sensu lato has the coloration typical of B. separans that makes the latter so identifiable…

wow, you really think so?
By: Martin Livezey (MLivezey)
2015-08-16 20:59:18 EDT (-0400)

I am counting on you on this one Igor…,! …in a good way of course!

Created: 2015-08-16 20:20:01 EDT (-0400)
Last modified: 2015-08-18 13:29:45 EDT (-0400)
Viewed: 104 times, last viewed: 2017-02-19 12:39:14 EST (-0500)
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