Observation 26526: Tylopilus rubrobrunneus Mazzer & A.H. Sm.
When: 2006-07-04
No herbarium specimen

Notes: Looks a bit like a young T. rubrobruneus from the top (see the first 2 pics), but the pores are yellowish; this feature alone removes it from that genus. NB: this collection was discovered in the same park (but different spot) and on the same day/year as that of observation #26489, so both could be the same thing.

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By: I. G. Safonov (IGSafonov)
2015-11-19 22:11:36 EST (-0500)

The observation is from 2006, but it was posted 3 years later. By that time I should have already known enough about boletes to be able to discern between the two genera/species, but somehow I got this ID wrong… Since then I have encountered enough T. rubrobrunneus to notice that the pore surface in young specimens is frequently of light yellowish gray (“avellaneous” or “drab”?) color. In this case, the camera flash magnified the yellow hue… Identification from photos on MO, as we all know, can at times be challenging due to ambiguities in colors brought to us by digital photography and visualization of images on computer screens. This is one of the examples; the other one, if you recall, is T. rubrobrunneus vs. T. violatinctus. :-)

I think the very small pores…
By: Dave W (Dave W)
2015-11-19 19:21:02 EST (-0500)

that is, the virtually smooth immature fertile surface favors Tylopilus. The pores on a Xanthoconium would likely be more easily discernible by the time the change to yellow occurs.

Here’s a few Tylopilus I’ve seen with beige to yellowish tinge on the pore surface. obs 138814, obs 139488, obs 70441 .

These look like Tylopilus rubrobrunneus to me
By: Bill (boletebill)
2009-10-10 22:20:20 EDT (-0400)

despite the pale cream color of the pore mouths.


Created: 2009-10-10 21:32:19 EDT (-0400)
Last modified: 2015-11-19 19:40:51 EST (-0500)
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