When: 2017-07-01

Collection location: Pride, Louisiana, USA [Click for map]

Who: Logan Wiedenfeld (LoganW)

No specimen available

Growing under oaks, with pine nearby. About as buggy as they come before falling apart.



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By: I. G. Safonov (IGSafonov)
2017-07-01 23:13:35 CEST (+0200)

It’s the cap color, the marbled olive-brown camo of the strongly clavate stipe that suggest something close to T. rubrobrunneus for your collection.
To my knowledge, there are no purple-capped Xanthoconium species in the USA. The caps of X. purpureum are purplish-maroon when very young and fresh (e.g., obs 25158 and obs 207159) and reddish-brown later on (e.g., obs 249308), and the stipes are concolorous but much paler. Some Tylos from the badiceps-ferrugineus group can be lookalikes of purpureum in pictures but less so in the field — see obs 24155 and obs 26524, both of which I think are Tylopilus.
After seeing many collections of Xanthos and Tylos over the years, the fine morphological tell-tale traits that form the gestalt generic and species concepts will eventually sink in.
I hope some of this helps.

Honest Question:
By: Logan Wiedenfeld (LoganW)
2017-07-01 21:23:15 CEST (+0200)

How do you distinguish between purple Tylopilus species and purple Xanthoconium?

My thinking was this fb was less purple and more maroon. There was no pinkish cast to the pore surface either. I think it’s also noteworthy that the bugs seem less inclined to go to work on bitter Tylopilus species, at least in my experience. I routinely fine mature sporulating fbs that are untouched or nearly so.

As always, Igor et al., I’m grateful for your help.