Observation 216693: Butyriboletus roseopurpureus (Both, Bessette & Roody) K. Zhao, Z.L. Yang & Halling, comb. nov.

Mixed conifer-hardwood forest.
Odor and taste not distinctive.


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Proposed Names

20% (2)
Recognized by sight
23% (3)
Recognized by sight
41% (3)
Recognized by sight: When does it become rosy enough for roseopurpureus, and not scarlet enough for speciosus. There is a spore size difference. If you saved a specimen of these, I would be interested in it.

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


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looks very similar
By: dario.z (dario13)
2015-09-23 21:00:27 CDT (-0400)
Thanks for the update, Noah
By: I. G. Safonov (IGSafonov)
2015-09-23 16:38:41 CDT (-0400)

Are you still interested in S. decipiens I collected for you a year ago?

By: Noah Siegel (Noah)
2015-09-23 12:37:20 CDT (-0400)

falls between the Butyriboletus (the Butter Boletes) and Xsudoporus. There were no recent collections of B. speciosus available to see where that ended up; but it will be somewhere in the same group.

As it is now, it could be placed into it’s own genus, or Butyriboletus could be expanded to include it and frostii…

By: I. G. Safonov (IGSafonov)
2015-09-23 01:39:48 CDT (-0400)

As far as I know B. pseudoregius is a strictly European taxon.

Thanks Igor,Noah…
By: dario.z (dario13)
2015-09-22 21:02:19 CDT (-0400)

What do you think about B.pseudoregius.

Good call, Noah!
By: I. G. Safonov (IGSafonov)
2015-09-22 19:21:56 CDT (-0400)

I was too tired to look into Bessettes’ guide in the wee hours of the morning. Otherwise I would have proposed the name myself as it readily keyed out in the guide just a few moments ago. :-)
It’s an excellent fit overall, except that the bluing is not as intense — perhaps Dario didn’t handle it too much.
Do you know where it falls in the bolete phylogeny tree, or what its closest relatives are?

Interesting collection and a beautiful bolete, Dario
By: I. G. Safonov (IGSafonov)
2015-09-22 03:20:22 CDT (-0400)

Reminded me of B. roodyi and B. rubissimus until I saw the bluing action and the prominent brownish reticulation covering most of the stipe. Surprisingly, the young specimens don’t have much red on the stipe, while the old, beat-up fb has quite a bit of it.
Looks like this could be a species belonging in Boletus sect. Appediculati (now known as Butyriboletus). Interestingly, B. speciosus is not in that new genus.

Created: 2015-09-21 21:56:47 CDT (-0400)
Last modified: 2018-01-10 21:39:30 CST (-0500)
Viewed: 195 times, last viewed: 2018-05-21 21:57:24 CDT (-0400)
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