Observation 102459: Boletus weberi group

When: 2012-07-22

Collection location: Franklin Parker Preserve, Chatsworth, New Jersey, USA [Click for map]

Who: I. G. Safonov (IGSafonov)

No specimen available

This interesting bolete (two fruitbodies), which remotely looks like Suillus spraguei, was found buried in sandy soil (only top of cap was visible) under pitch pines and scrub oaks.
The overall stature is more like of Suillus though, or maybe Fuscoboletinus. The rims of pore mouths are red, while the tubes themselves are yellow. This discoloration is not necessarily an inherent feature of this mushroom and could have been caused by the weather elements; I have seen a similar phenomenon in a yellow-pored boletes before (e.g., Obs. 767870).

The younger mushroom is 5 cm in height (from tip of root to top of pileus); the cap diameter is 4 cm; the stipe diameter is 1.3 cm.

No bruising of the pore surface or on cap/stipe; the pores are irregular and not radially arranged. The were droplets of greenish liquid (usually associated only with B. frostii) on the pore surface.

The flesh is dense and doesn’t stain when exposed to air.

Ammonia is negative on cap and flesh, but KOH stains both pale brown.


KOH stains flesh pale brown (right half); Ammonia is negative (left half)

Proposed Names

28% (1)
Recognized by sight
57% (1)
Eye3 Eyes3
Recognized by sight: See comments under this name in obs 179586

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: I. G. Safonov (IGSafonov)
2017-06-14 12:03:28 PDT (-0700)

I would not reject con-specificity based on non-matching chemical tests alone, but in addition to that some of the morphological details are off (e.g., the more vivid colors of the cap, stipe and context) vis-a-vis the info in BENA. Still, IMO, the overall similarity is striking, and this is as close to weberi as it gets based on gestalt morphology and the fact that some southern critters like to creep up as far north as NJ & NY along the Atlantic coastal plains, but I am cautiously optimistic. Regardless, there is nothing else looking like this from our part of the country; it’s a rare bolete known only from one or two locations in the Pine Barrens habitat.
FYI, I posted an exhaustive account on this bolete in obs 179586, which had been collected in the same spot. I still need to measure the spores, which I will do later today.
Unfortunately, Ron Pastorino’s collection of B. weberi from TX, obs 3102, is likely to be in Chicago and beyond my reach, and the Bessettes don’t have a collection in their personal herbarium. It would be nice to get hands on a reliable identified material from the Gulf states for a genetic comparison.

Checking on the ID
By: Scott Pavelle (Scott Pavelle)
2017-06-14 10:48:02 PDT (-0700)

I’m reading up on B. weberi in BENA. There’s an inconsistency in the Ammonia results. According to the authors the flesh should “quickly stain greenish blue with NH4OH.” But I know it’s one of the ones you got DNA tested. What are the conclusions? Is the chemical test (as usual – grrrr) unreliable, or do you have a companion species here to explain the “group” name designation?

Ha ha!
By: Martin Livezey (MLivezey)
2012-09-03 19:00:11 PDT (-0700)

The unseen drama at NEMF. Good luck with that! Let us know what he finds out – and keep looking for more! I can’t help thinking about the Alan’s comment that some of these things only appear once every 40 or 50 years. I am not sure if he was joking or not, but you never know.

Thanks for asking, Martin
By: I. G. Safonov (IGSafonov)
2012-09-03 17:35:56 PDT (-0700)

In short, the answer is “No”, but I gave the dried specimen to Roy Halling at the conclusion of the NEMF. I hope he finds the time to run DNA analysis or at least do some microscopy. I certainly want to think that this is a new species restricted to the coastal plane that will eventually be named after me. :-)

By: Martin Livezey (MLivezey)
2012-09-03 17:26:31 PDT (-0700)

Did anyone ever come to a consensus on this one?

By: I. G. Safonov (IGSafonov)
2012-07-23 21:55:00 PDT (-0700)

Quite a striking bolete, indeed. If this one were easy to ID, either you or I would have named it already. :-)

I have dried this specimen, and will eventually get some spore data (maybe at the NEMF). Perhaps then we would be able to at least place it into a genus.

By: I. G. Safonov (IGSafonov)
2012-07-23 21:44:47 PDT (-0700)

I doubt this is B. flammans — there is no bluing on the pores or exposed flesh.

Could this be
By: Eric Smith (esmith)
2012-07-23 21:17:38 PDT (-0700)

B. flammens?

Nice stem
By: walt sturgeon (Mycowalt)
2012-07-23 21:08:53 PDT (-0700)

This should be easy to ID.

Created: 2012-07-22 19:02:30 PDT (-0700)
Last modified: 2017-03-21 16:59:16 PDT (-0700)
Viewed: 171 times, last viewed: 2018-03-17 11:02:54 PDT (-0700)
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