Observation 139828: Cyanoboletus pulverulentus (Opat.) Gelardi, Vizzini & Simonini

When: 2013-06-30

Collection location: Southford Falls State Park, Connecticut, USA [Click for map]

Who: damon brunette (damonbrunette)

No specimen available

Proposed Names

-17% (5)
Used references: Bessette
Based on microscopic features: KOH on cap was red. On pores red orange.
38% (4)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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This obs fits my concept of pulverulentus.
By: Dave W (Dave W)
2013-07-15 15:00:51 CDT (-0400)

However, the commentary echos the variability of macro-characters that I have observed in collections I have IDed as pulverulentus. For instance stipe color seems to range from yellow to brown.

Last summer one of local club members brought a collection of what IMO was pulverulentus to a club function. He had IDed it as rainisii, and the macro-features did seem to better fit that western NA species. But for reasons like those mentioned below, I considered it to be an example of pulverulentus.

Last summer I attended Alan Bessette’s bolete slide show presentation at the NEMF foray. I recall that his account of the naming of B. rainisii began with a collection that was originally considered to be pulverulentus.

The ones I ID as pulverulentus seem to occur with a variety of tree types… between apple and Shagbark Hickory in my back yard, in an open oak area, and along a trail through birch, beech, hemlock woods. Also considering the variability in KOH reaction with pulverulentus, it seems reasonable to consider the possibility of more than one species.

By: walt sturgeon (Mycowalt)
2013-07-14 16:49:17 CDT (-0400)

would produce a green flash on B.pulverulentus according to Bessettes/Roody.
I guess I am skeptical of a west coast species associated with western hemlock and Douglas Fir showing up way East of the Rocky Mountains.

And clearly wrong color KOH on cap for pulverulentus at any rate..
By: damon brunette (damonbrunette)
2013-07-14 14:16:38 CDT (-0400)

Kuo has black for cap when we got red.

By: damon brunette (damonbrunette)
2013-07-14 14:06:23 CDT (-0400)

Hemlock, mixed hardwoods. Bill Yule asked the person who found this, Robert gergulies, to key it out. When he presented it as rainisii, Bill and myself concluded that it keyed out better this than pulverulentus. The Bessette descriptions for the twosome emphasize the more yellowed stipe, and green bruising, which this specimen has. We will go back and look at some chemical tests between the two.

By: walt sturgeon (Mycowalt)
2013-07-13 21:40:48 CDT (-0400)
By: damon brunette (damonbrunette)
2013-07-13 21:18:05 CDT (-0400)

Im sure we will get lots of weighing in on this one. The description in Bessette is most definitely open to to rainisii both macroscopically and geographically speaking. “limits to be established” Not to mention Bessette anecdote about a possible misnaming by Theirs….
The physical attributes of this specimen match rainisii much more clearly…
Daves OB http://mushroomobserver.org/70431?q=1MkwQ mentions a KOH staining of the blued context to immediate orange, where this had zero coloration in context.

B. rainisii
By: I. G. Safonov (IGSafonov)
2013-07-13 20:52:29 CDT (-0400)

To my knowledge, this bolete only grows on the West Coast & PNW. The corresponding eastern species is Boletus pulverulentus.

Created: 2013-07-13 20:26:40 CDT (-0400)
Last modified: 2015-02-05 19:16:31 CST (-0500)
Viewed: 113 times, last viewed: 2018-04-18 20:24:00 CDT (-0400)
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