Observation 137720: Boletus subcaerulescens ( E.A. Dick & Snell) Both, Bessette & A.R. Bessette

When: 2013-06-26

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

Who: AJ (j7u)

No specimen available

Proposed Names

28% (1)
Recognized by sight
12% (2)
Recognized by sight
-22% (3)
Based on chemical features: Dark purple reaction on cap surface with Ammonium hydroxide solution

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Some of my collections of subcaerulescens…
By: Dave W (Dave W)
2013-06-27 11:52:54 UTC (+0000)

have showed no bluing on the pores, but have shown bluing on the context where the tubes are attached to the cap (remove tubes). A few specimens have shown bluing on the stipe. And a few buttons that I have harvested showed no bluing at all. If you search MO for my subcaerulescens posts, the ones you will see all come from the same patch. The link shows a collection with lead photo showing a specimen with reticulations that are not brown.

Pore surface
By: AJ (j7u)
2013-06-27 04:33:07 UTC (+0000)

remains white after ammonia application and scratching with my fingernail

B. subcaerulescens
By: I. G. Safonov (IGSafonov)
2013-06-27 03:46:16 UTC (+0000)

This is what I thought too it might be, but the reticulation (while having the right pattern) is not sufficiently brown even at this stage of development. Also, there is no report of bluing pore surface for this specimen…

I remember a very vitriolic discussion last year on a species posted by Dave W that looked like a hybrid between X.s. and B.s. Thus, I would rather go with the concept of Boletus edulis group, pending further evidence to bolster any of the current ID proposals.

By: AJ (j7u)
2013-06-27 02:33:08 UTC (+0000)

I added a photo of what the cap looks like now (hours later) with the ammonia reaction

By: walt sturgeon (Mycowalt)
2013-06-27 01:43:45 UTC (+0000)

vs. deep blue. Could be describing the same ammonia reaction.

Ammonium hydroxide
By: AJ (j7u)
2013-06-26 22:18:15 UTC (+0000)

solution gave a deep purple stain on the cap surface. Thanks I. G.

Ammonia test for X. separans
By: I. G. Safonov (IGSafonov)
2013-06-26 22:00:52 UTC (+0000)

If you still have the specimen, could you place a drop of ammonia onto the cap or stipe. That should give you an unambiguous ID…

Red/purple staining on cap
By: AJ (j7u)
2013-06-26 21:57:38 UTC (+0000)

appeared slowly where damaged, especially on the margin

Created: 2013-06-26 21:32:40 UTC (+0000)
Last modified: 2017-09-16 04:43:46 UTC (+0000)
Viewed: 132 times, last viewed: 2017-09-24 22:07:35 UTC (+0000)
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