Observation 169563: Boletus separans Peck
When: 2014-07-09
No herbarium specimen

Notes: See obs. 169559

Proposed Names

61% (2)
Eye3 Eyes3
Used references: North American Boletes

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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I agree
By: Phil (gunchky)
2014-07-13 19:50:40 EDT (-0400)

with Walter. Age does make a difference, but at what stage of developement does one expect to see the described chemical reaction? Young specimens may not be fully developed; older ones may have been bleached out and/or too diluted in their chemical makeup. Try species of different ages. As to applying chemicals to certain area of the pileus, I can understand why- I hope. If I’m correct and one applies chems to an area where the pilepellis has been compromised, one my get a different reaction. If one portion is dry and the other soggy, you may also receive different results, etc. Let me know if I’m in the ballpark. Also B. separans has violaceous tones on certain portion that may produce various coloration in KOH and NH4OH. Chack the Big Bolete book.

I brought home a bagful of this type today.
By: Dave W (Dave W)
2014-07-12 22:47:09 EDT (-0400)

Selected a few pieces of cap from specimens of differing age and put some ammonia on each one. Not much reaction noted, except a weak greenish flash on one young cap.

I think the problem I’m running into is that by the time I get home from a long day of hunting, and begin to sort stuff, and get stuff ready for the dehydrator, and eat dinner, and have a drink… too much time has passed to get a decent chemical reaction. I guess I just need to find room inside my foray kit for a couple little eye-drop bottles full of KOH and ammonia.

But I had not considered “age of the fruiting.”

But, on the other hand, there have been a few reaction tests I have performed on newly emerged material (eg. Tylopilus… probably T. rubrobrunneus) collected 20 yards from my front door when virtually no time had lapsed between collecting and testing, and obtained results markedly different from what is reported. So I wonder just how much one may depend upon these tests.

Color Reactions
By: walt sturgeon (Mycowalt)
2014-07-12 10:51:50 EDT (-0400)

are variable and depend on the age of the fruitings and where on the caps you test.

Try KOH
By: Phil (gunchky)
2014-07-12 10:31:37 EDT (-0400)

and NH4OH. Nice color reaction on both pilepellis and stipitpellis. I should have photographed the reactions. Would have made nice photos.

I have a spot in Red Rock…
By: Dave W (Dave W)
2014-07-12 00:46:08 EDT (-0400)

where separans and B. nobilis grow together. As the two types age, they can become almost impossible to tell apart in the field. From what I’ve heard, the ammonia reaction on the cap surface is dependable trait. I haven’t yet tried it.

The two in this obs appear to be fairly young. The uneven cap surfaces and stipes with light lilac/purplish/tannish flush both point toward separans.

Created: 2014-07-11 22:10:42 EDT (-0400)
Last modified: 2014-07-12 00:39:27 EDT (-0400)
Viewed: 62 times, last viewed: 2016-10-28 08:24:26 EDT (-0400)
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