Observation 69780: Boletus edulis Bull.
When: 2009-10-15
No herbarium specimen

Proposed Names

79% (4)
Eyes3
Recognized by sight: Looks more like a pitted cap edulis

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Sorry about the confusion
By: Dave W (Dave W)
2011-09-13 06:49:59 PDT (-0700)

with obs 25104. The mushroom seen in 69780 (the obs being discussed here) is the same as seen in the first two pics of 25104.

http://mushroomobserver.org/25104?q=6wNR

I had made the 69780 post as a complement to another discussion about an alleged specimen of B. nobilissimus. When I made this subsequent post, I guessed at the collection date… was off by a month. (When I first registered here at MO I did so on two different computers. I used two names because I did not realize that i could use register twice using the same name. I am, in fact, “Dave in NEPA.”)

Anyway, the two different specimens seen in 25104 came from the same area. I have never found X. separans in this area. And, even if separans does occur in this area, it’s likely done fruiting by mid September.

I think that 25104 is a better place to continue this discussion.

Thanks Noah;
By: Dave W (Dave W)
2011-09-13 04:46:29 PDT (-0700)

all very helpful. But may one determine cap cuticle structure based upon the low res photo? I really need to get back to where I’ve found this type and get another one!

nice explanation.
By: Debbie Viess (amanitarita)
2011-09-12 19:40:38 PDT (-0700)

thank you.

nobilissimus vs. edulis
By: Noah Siegel (Noah)
2011-09-12 18:13:39 PDT (-0700)

The cap surface texture is key. “tomentose to fasciculate-tomentose, becoming appressed-tomentose, strongly pitted to corrugated…” People on MO seem to be assigning various and sundry porcini to nobilissimus based on the reticulation, but stalk reticulation is not a very good character in the edulis group while the nature or structure of the cap cuticle is.
B. reticulatus in Europe, for example, is often very prominently reticulate but not always. The original description of B. nobilissimus is apparently based on a single locality so there hasn’t been much of a chance to observe the consistency of reticulation within the species. Specimens I have seen showed coarse, lengthy reticulation in youth but scarcely any in old age, while the cap surface showed the fascicled hairs in all stages. I hope that is helpful.

Here is a closeup photo of the cap of B. nobilissimus

OK, make your argument fellas…
By: Debbie Viess (amanitarita)
2011-09-12 09:17:16 PDT (-0700)

WHY edulis, when so many features are right in line with nobilissimus?

I confess my experience w/nobilissimus is limited, so I’d really like to hear the theory behind the ID statement.

Well, although
By: Dave W (Dave W)
2011-09-12 08:47:54 PDT (-0700)

nobilissimus does seem to fit, now I’m wondering. Hopefully, I can get to the trail where I find this type each Sept/Oct and bring a couple home for the KOH test, and the dehydrator. I think I should preserve one of these for potential study. But the 40 mile drive may now be an 80 mile drive, with so many rural roads washed out around here.

For the time being, I think “edulis” nosing out “nobilissimus” as the accepted species name seems pretty sensible to me.

on the other hand…
By: Debbie Viess (amanitarita)
2011-09-12 08:38:01 PDT (-0700)

why not nobilissimus? the cap color and pitting fits; the pore color fits; the stipe reticulation fits. all that I am not clearly seeing is the sterile tissue extending out beyond the cap edge.

why a lots of odd-characters edulis rather than a pretty spot-on nobilissimus???

KOH/NH4OH testing could separate the two species: edulis cap turns orange, nobilissimus turns vinaceous purple.

But even without that confirmation, I’m throwin’ in with your first ID guess, Dave.

I agree with this Debbie.
By: Dave W (Dave W)
2011-09-12 08:22:12 PDT (-0700)

But the ones that I consider to be our native edulis types (not the ones which associate with Norway Spruce) tend to have fine reticulations that do not extend below the halfway down part of the stipe.

variation on a theme
By: Debbie Viess (amanitarita)
2011-09-12 08:12:15 PDT (-0700)

edulis can show varied reticulation in different populations. this is at the extreme end of coarsely reticulated.

The completely
By: Dave W (Dave W)
2011-09-12 08:02:02 PDT (-0700)

and coarsely reticulated stipe seemed unusual for edulis… especially for the native eastern NA varieties. This was found in a mixed woods with lots of hemlock and a variety of hardwoods. I have found this type in the same location (Haystacks area of the Loyalsock Trail) a few different years.

Looking again at B/R/B, nobilisimus does seem like a longshot, as only one collection of this species has been reported. Hoping to return soon to where I have found this the type seen here. Don’t know if it’s feasible, though, with so many raods washed out around here.

Created: 2011-06-20 20:37:14 PDT (-0700)
Last modified: 2011-09-13 07:16:21 PDT (-0700)
Viewed: 416 times, last viewed: 2016-10-23 09:33:43 PDT (-0700)
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