Observation 71548: Boletaceae Chevall.

When: 2011-07-13

Collection location: Washington Crossing State Park, Mercer Co., New Jersey, USA [Click for map]

Who: I. G. Safonov (IGSafonov)

No specimen available

I’ve been finding this kind of bolete, or variations on its theme, at Wash. X-ing a few times in previous years. Despite the pore surface color appearing somewhere between “wheat” and “earth yellow”, I think it is not Xanthaconium purpureum, but some kind of Tylopilus sp. The flash makes the stipe look reddish; actually it is pale brown; the pileus is dull purple-red.



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k looking back at 26526
By: Bill (boletebill)
2011-07-15 12:26:14 PDT (-0700)

I still have to say that that looks like T. rubrobrunneus to me, despite the creamy cast to the pore mouths. I admit that I have a lot of ambivilence about the significance of the color of pore mouths in the range of white, creamy pale yellow and those shades when viewing a photo on the net with respect to Boletus, young Tylopilus and Xanthoconium. I find all three can have that color cast in photos depending on light, exposure, flash and the current environmental conditions, i.e. drying out can cause a creamy yellow cast to the appearence of the pore mouths in each of those genera. As the individual mushroom matures their characteristic pore surface color becomes more diagnostic. Having said all that hey, I don’t know really, often ID from pics are just guesses and there’s much room for error. i just offer my opinion when I think it might be helpful. I have dozens of pics of both X. affine and X. purpureum and this weekend I post some to consider. maybe that’ll be useful.

ah, the heartbreak of insufficient documentation….
By: Debbie Viess (amanitarita)
2011-07-15 10:36:46 PDT (-0700)

still, lovely little bolete, regardless of whether or not we can ever get a good name for it.

on the other hand, next time, it would be great if you could grab one and do the full work-up. inquiring minds want to know!

By: I. G. Safonov (IGSafonov)
2011-07-15 10:31:23 PDT (-0700)

I have a lot of familiarity with Xanthoconium affine, which is very common in the parts of NJ I frequent for the purpose of mushrooming. It’s my understading that X. purpureum and X. affine are almost identical in overall appearance, with exception of their respective color schemes. In my experience, one of the distinguishing characteristics of X. affine is the stipal tissue — it has a “translucent” quality to it, like that of marble or ivory; the same is likely be true for X. purpureum. The mushroom in this observation did not have this kind of a stipe, which admittedly, coupled with the yellowish pore surface, is rather a shaky evidence to call it Tylopilus rather than Xanthoconium. Also, please see observation #26526, which you happened to comment on.

I appreciate your comments I.G.
By: Bill (boletebill)
2011-07-15 04:57:08 PDT (-0700)

I often see and an unusual mushroom and just snap a pic knowing I won’t have time to work on it later. I guess my question should have been what was it about this mushroom that made you think it WASN’T Xanthoconium?

By: I. G. Safonov (IGSafonov)
2011-07-14 22:12:30 PDT (-0700)

I agree — all the questions you are posing me with are very relevant to successfully IDing the genus. Clearly, I didn’t do a thorough job on this bolete, but I was just passing through the park on my way home late, knowing that I wouldn’t have time to work on anything afterwards. Unfortunately, bruising the pore surface to obtain a color change did’t occur to me at the time…

If the genus is in question I can’t help but asking why not make a sporeprint?
By: Bill (boletebill)
2011-07-14 11:50:17 PDT (-0700)

The two genera in question do have slightly differt spore colors and spore shapes. Or for that matter why not look at a spore? And what about staining of the pore surface: Reddish brown or Golden brown? I have to admit it looks likes a Xanthoconium to me from the pic. But of course it’s JUST a pic. Just curious.

Created: 2011-07-13 22:03:13 PDT (-0700)
Last modified: 2011-07-14 20:26:55 PDT (-0700)
Viewed: 140 times, last viewed: 2018-05-05 18:38:52 PDT (-0700)
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