Observation 100807: Boletus L.
When: 2012-07-15
No herbarium specimen

Notes: pores stain blue veeeery slowly, the flesh turns slightly bluish faster. cap chestnut-brown with ammonia

Proposed Names

11% (3)
Eye3
Recognized by sight
84% (1)
Eyes3
Recognized by sight: subtomentosus group but clearly not subtomentosus … ferrugineus var. variecolor maybe.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Well, there are visible yellow tones in the cap
By: Dmitriy Bochkov (convallaria)
2012-07-18 02:10:06 PDT (-0700)

I think the section here looks pretty much like the cross section of subtomentosus in http://boletales.com/... – the British Bolete Book, but that is just a drawing. Ferrugineus there looks like not bluing at all.

Could be an argument.
By: Gerhard Koller (Gerhard)
2012-07-17 13:13:41 PDT (-0700)

As usual I do not think that the real X. subtomentosus naturally does occur in Northern America but I may err.
Nevertheless I would call this rather X. ferrugineus or its variety or something else than subtomentosus but I do not rule it out completely. The argument with the photoing is a good one.

I don’t know the varieties of…
By: Dave W (Dave W)
2012-07-17 13:06:51 PDT (-0700)

B. subtomentosus. So perhaps it my habit to lump varieties under the name “Boletus subtomentosus.” But this specimen looks like what I use this name for here in Pennsylvania, USA.

Phillips says this about the context of B. subtomentosus…. “Flesh white in cap with a date – brown line beneath the cuticle, rust above tubes and flushed lemon-yellow in base of stem, hardly blueing or not at all on cutting.” This matches the obs very well. In particular the brown line beneath the cuticle seems like a good character.

Kuo describes the context color of subtomentosus as either yellow or white.

One thing I have noticed about some of my posted observations. Light yellow context color sometimes does not photograph very well. It often looks white in the photo.

Context is white not yellow.
By: Gerhard Koller (Gerhard)
2012-07-16 04:52:31 PDT (-0700)

Cannot be B. subtomentosus which has yellow context.

Created: 2012-07-15 23:22:41 PDT (-0700)
Last modified: 2012-07-28 09:00:40 PDT (-0700)
Viewed: 113 times, last viewed: 2017-01-16 08:48:39 PST (-0800)
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