Observation 24889: Boletus pseudosensibilis A.H. Sm. & Thiers
When: 2009-08-30
No herbarium specimen

Notes: Open mixed deciduous woods; some oak present, but lots of birch and ash. yellowish context stains fairly dark blue, but not quickly. Pics show stem context staining after about 1 minute and then after several minutes. Pores bruise blue, then bruise becomes darker, then bruise becomes dark reddish after about 10 minutes. Pic shows three scratches with small one in middle being only a few seconds old. No noticable odor with fresh specimens. KOH on cap very dark fading to mahagony. KOH on stem surface orange. KOH on context slightly orange. These pics were taken about an hour after harvesting; red tints on stalks are not as evident as when fresh.

B. pseudosensibilis or B. pallidoroseus are my best guesses. Complete lack of reticulations on stalks elimate speciosus types. Blue to reddish brusing of pores is something I have seen on what I previusly IDed (last year) as B. pulverulentus; so that would also be a guess.

Proposed Names

51% (3)
Eye3
Recognized by sight
64% (4)
Eyes3
Recognized by sight: Looks pretty good for B. pseudosensibilis

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Just for comparison
By: Martin Livezey (MLivezey)
2012-06-22 21:50:51 PDT (-0700)
Yeah, the overall staining isn’t dark enough
By: Dave W (Dave W)
2009-09-08 04:52:27 PDT (-0700)

for pulverulentus. Another possibility may be B. miniato pallescens. The blue to reddish bruising of the pores reminds me of collections of miniato olivaceus, but the cap and pore colors are a bit off for this one. Still leaning toward pseudosensibilis; even though I found no noticable odor. These reddish capped yellow fleshed blue stainers can be pretty confounding.

Found some similar boletes in a different habitat type over the past weekend, but with reticulate stalks. These are likely in the speciosis group (speciosus?… this “is” “us” thing really gets me!). Will post as soon as I get the time.

It’s not B.pulverulentus as pointed out already.
By: Gerhard Koller (Gerhard)
2009-09-07 17:08:50 PDT (-0700)
Boletus pseudosensibilis.
By: Bill (boletebill)
2009-09-02 07:00:33 PDT (-0700)

Your description and photos are great and this mushroom fits my experience of B. pseudosensiblis but as you note there are other possibilities. As useful as macro-chemical test reactions are I find they vary quite a bit depending on geography, the strength and age of your reagents, and the age and freshness of your mushroom.
B. pulverulentus blues violently everywhere and leans toward the black end of blue at that, at least in CT.

Bill Yule

Created: 2009-09-01 19:48:05 PDT (-0700)
Last modified: 2015-01-30 03:37:04 PST (-0800)
Viewed: 182 times, last viewed: 2016-10-21 03:08:31 PDT (-0700)
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