Notes:
Found in sandy sandy soil. Lots of water oaks and postoaks with some walnut and juniper. No staining, bright pores, yellowish stem. Flesh context unchanging. Couldn’t determine any scent but the cap cutlicle was a little tart. Chem reactions shown

Images

Chem test left to right:
KOH, FeSO4, and NH4OH
Chem test left to right:
KOH, FeSO4, and NH4OH
Chem test left to right:
KOH, FeSO4, and NH4OH
Chem test left to right:
KOH, FeSO4, and NH4OH
No pore bruising.

Proposed Names

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= Observer’s choice
= Current consensus

Comments

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By: I. G. Safonov (IGSafonov)
2017-09-16 22:05:43 PDT (-0700)

This is certainly an interesting and unusual collection.
First, I agree that this likely belongs in Aureoboletus, as the visible morphology fits the core generic concept. As to the species, gentilis certainly makes sense based at least on the geography, but…
To begin with, gentilis is a European taxon. North American Boletes by Bessette et al. (2000) claims that it’s rare in NA, and its known distribution range at the time was FL west to MS. Unfortunately, the most recent ‘bolete bible’, Boletes of Eastern North America by the same authors (2016), doesn’t feature gentilis; it’s only mentioned in passing therein as a lookalike of Aureoboletus auriporus. It would be interesting to see if the occurrence of gentilis in NA has since been confirmed by DNA studies.
Indeed, the close morphological similarity between the two species suggests they are ‘twins’. Not surprisingly, phylogenetically they are also twins, as they share one of the outer/terminal nodes in the 4-loci phylogram in Wu et al. (2016). Aureoboletus has a complex phylogenetic structure. For instance, the seven known exclusively eastern NA species (abruptibulbus, auriflammeus, auriporus, innixus, projectellus, roxanae, and russellii) are part of 5 unique ‘lineages’ within the genus, each of which is also populated by species endemic to other parts of the world, meaning that the ‘americans’ have evolved from different most recent common ancestors and have less in common with each other than with their immediate ‘foreign cousins’. But I am digressing… For pictures of bona fide gentilis from Europe, see obs 215466 and http://boletales.com/genera/aureoboletus/a-gentilis/.
Back to your mushroom… For what it’s worth, the stipe ornamentation seen here – a dense pattern of yellow scruffy scales on a white background – is not consistent with either auriporus or gentilis, both of which have smooth, glabrous and occasionally shiny stipe surfaces… The best way to ascertain the ID of your bolete is to get it sequenced.

Nice observation
By: Scott Pavelle (Scott Pavelle)
2017-09-13 09:38:51 PDT (-0700)

I’m looking forward to seeing what folks have to say. Forgive me, but I will not venture an opinion on a mushroom that far from my stomping grounds in Pittsburgh. It would be nothing more than running the data through a key and reciting what spits out. (Which would probably be auriporus or curtisii FWIW).

Created: 2017-09-13 06:42:13 PDT (-0700)
Last modified: 2018-06-10 08:17:16 PDT (-0700)
Viewed: 119 times, last viewed: 2019-06-29 12:03:05 PDT (-0700)
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