Observation 74227: Boletus nobilis Peck

When: 2011-08-18

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

Who: Dave W (Dave W)

No specimen available

South facing slope with washdown and oaks.


Proposed Names

63% (3)
Recognized by sight
Used references: B/R/B
29% (1)
Recognized by sight
Based on chemical features: Did not apply ammonia, so it’s difficult to rule out separans.

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= Observer’s choice
= Current consensus


Add Comment
Well, Phil…
By: Dave W (Dave W)
2016-04-06 19:03:48 CDT (-0400)

this is starting to look like a situation where the more I learn the less I feel like I know.

Looking at a few different sources, it seems like the one trait that may be dependable is KOH on the cap surface. Color reactions are reported as quite different for separans vs. nobilis. Ammonia reaction on the cap of separans is often considered to be a good diagnostic feature, although the separans/ammonia color reaction is different with pinkish/lilac and tannish capped specimens. Either way, ammonia reaction seems to be quite vivid on the cap of separans.

I lean toward nobils when the mushroom(s) lack ant pinkish/lilac tones. Hopefully, I can find a few of these presumed nobils again and look at the ammonia reaction on the cap. With such a pristine collection as the one in this observation, I am pretty single-minded about getting them into the dehydrator. I suppose I should make a few sacrifices for science :-)

By: Phil Yeager (gunchky)
2016-04-06 17:15:18 CDT (-0400)

Kuo mentions the possibility of no pinkish or lilac tones in old age for B. separans. These mushrooms look fairly young and robust. What thinkist thou?

I think these are B. nobilis.
By: Dave W (Dave W)
2016-04-04 19:54:43 CDT (-0400)

But Boletus separans is a fairly variable species, sometimes without lilac/pinkish tones. So I’m wondering if this is a viable possibility here.