Observation 217507: Cyanoboletus pulverulentus (Opat.) Gelardi, Vizzini & Simonini
When: 2015-07-09
No herbarium specimen

Notes: Grown all around on a lawn near old growth trees. Stained blue when touched with gentle force.

Proposed Names

-7% (3)
Recognized by sight
30% (2)
Recognized by sight
-30% (2)
Recognized by sight: It would help to see a photo of the top as well.
-30% (2)
Recognized by sight: Pore surface bluing is too intense and the upper portion of the stipe is too glabrous for the species. Bluing on stipe is visible, too.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Athena (Apfelmusser)
2015-10-12 23:10:46 EDT (-0400)

It was growing under an oak, i believe, in my friend’s yard. Her house is rather out of the way, but I can try to see if she could harvest and cut it up— I observed these pretty guys back in July!

@dave, the mushroom was slow to bruise blue but everywhere I touched it turned that really dark blue. That’s for sure from me manhandling them to show my friends how cool boletes are :>

Believe it or not…
By: Dave W (Dave W)
2015-10-04 01:55:15 EDT (-0400)

this crazy-staining bolete is edible! BRB says so, and I can confirm that a small portion fried in oil caused no problem for me.

By: I. G. Safonov (IGSafonov)
2015-10-03 20:40:58 EDT (-0400)

I do remember that obs of yours – I even commented on it! :-) That’s easily the prettiest and most photogenic C. pulverulentus on MO as your careful handling of the fbs paid off. M. Kuo calls it “the dirty bolete” and for a good reason — it’s propensity for staining is well known.

I saw the small dark spot on the stipe.
By: Dave W (Dave W)
2015-10-03 18:01:51 EDT (-0400)

But I had not noticed the dark area on the pores. This does look like the dark bruise one expects with C. pulverulentus.

Here’s a collection I made where I tried my best to avoid bruising the mushrooms (at first). This species pops up in my back yard virtually every summer.
obs 170957

By: I. G. Safonov (IGSafonov)
2015-10-03 17:00:38 EDT (-0400)

I see bluing on the stipe right next to the discoloration on the pore surface. I surmise, Athena inadvertently touched the stipe there when bruising the pores. Lack of staining elsewhere on the stipe can be explained by the way the mushroom was picked and handled (manipulating it by the cap).
There are other photos of the species that show lack on staining on the surface due to careful handling, e.g.,:

By: Dave W (Dave W)
2015-10-03 16:01:21 EDT (-0400)

I had initially thought about proposing “C. pulverulentus”, but I see no blue/black staining on the mushroom. It’s actually difficult to handle this type mushroom without inducing staining. Athena, did you notice any staining as the mushroom was handled? Did you slice it?

By: Shane Marsh (Mushane)
2015-10-03 06:17:05 EDT (-0400)

Do you happen to have a picture of the top? Taking pics at multiple angles, as well as knowing what kinds of trees they are growing under, will greatly help us ID this.

Created: 2015-10-02 15:23:57 EDT (-0400)
Last modified: 2015-10-03 19:45:15 EDT (-0400)
Viewed: 88 times, last viewed: 2016-10-23 06:48:41 EDT (-0400)
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