Observation 174530: Tylopilus rhodoconius (Singer) T.J. Baroni, Both & Bessette
When: 2014-08-17

Notes: > A single specimen collected by J. or N. Burghardt at an unknown location in FPP.
> A fairly small but hefty mushroom with hard and dense flesh.
> The brown cap color appears to be original, i.e. not whitish and then staining brown; the stipe, however, was light colored before turning brown in age and after handling.
> The exposed context discolored pale reddish-brown and smelled of bleach (consistent with peralbidus/rhodoconius)
> Bitter tasting flesh
> The mushroom didn’t drop spore on account of being immature

Macro-chemical tests:

KOH = bright yellow (same color as KOH on A. bisporigera) on exposed context and dark reddish-brown on cap cuticle
FeSO4 = instantly deep grayish blue on exposed context and bluish-gray on cap cuticle.

The observer reaction of FeSO4 on context is consistent with T. rhodoconius (B-R-B), but KOH on context is consistent with T. peralbidus.

Proposed Names

57% (1)
Eye3 Eyes3
Used references: North American Boletes by Bessette-Roody_Bessette
Based on chemical features: Flesh instantly staining deep grayish-blue with FeSO4

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Thanks, Martin
By: I. G. Safonov (IGSafonov)
2014-08-20 18:21:31 PDT (-0700)

Contrary to its appearance, the fb was fresh and firm. Regrettably, we found it too early, i.e. before the tubes opened up to drop mature spores. I guess we are lucky to have had the rain to collect all these interesting mushrooms from the NJ coastal plains, while most of north Jersey has been very dry for the last two weeks and likely to stay that way for a while.

Too bad
By: Martin Livezey (MLivezey)
2014-08-20 16:51:03 PDT (-0700)

there were not a few more fb. It is hard to get a good sense of what is typical. This looks like it got pretty seriously dried out just as it was getting started. But congrats! anyway. I have not seen this one before.

Too bad
By: Martin Livezey (MLivezey)
2014-08-20 16:50:30 PDT (-0700)

there were not a few more fb. It is hard to get a good sense of what is typical. This looks like it got pretty seriously dried out just as it was getting started.

Thanks, Dave
By: I. G. Safonov (IGSafonov)
2014-08-20 15:36:54 PDT (-0700)

I found T. peralbidus in the Pine Barrens in the past, but it always had much paler cap colors. Macrochemical tests are more consistent with it than with those of T. rhodoconius. KOH on flesh alone should probably eliminate the latter from consideration, unless there is a mistake in the published descrition. I just thought it would be cool to be the first one to post T. rhodoconius on MO. :)

Really interesting bolete, Igor.
By: Dave W (Dave W)
2014-08-19 18:40:40 PDT (-0700)

Nice find.

Created: 2014-08-18 22:45:47 PDT (-0700)
Last modified: 2014-08-18 22:47:25 PDT (-0700)
Viewed: 49 times, last viewed: 2016-10-28 10:05:22 PDT (-0700)
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