Growing under live oaks. Stipe is yellow with flushes of red-brown. Pore surface stains blue and then brown, is yellow with a suggestion of orange. Context bruises blue rapidly. Cap is glabrous and reddish-brown, with the disc being the brightest. The margins are lighter, almost yellow.

Species Lists



Proposed Names

30% (2)
Recognized by sight
56% (1)
Based on chemical features: LSU sequence — see comment below

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= Observer’s choice
= Current consensus


Add Comment
“The chameleon bolete”
By: I. G. Safonov (IGSafonov)
2018-12-04 05:52:01 CET (+0100)

Floridanus was not on my radar either when I studied you pictures, Logan. But then I can always vindicate myself by my total lack of field experience with this species. :-)
Originally, I was hoping for this to be a sp. nov., so I optimistically ordered TEF-1 for it, as well. Upon receipt of the LSU read a couple of days ago, I cancelled TEF-1 immediately, but the work may have already been done (we shall see). Like I said, this species hasn’t yet been probed for this locus, so there is no additional benefit as far as the current identification to species is concerned. On the other hand, a new genetic data point for floridanus would be of benefit to science, for it happens to be linked to a public voucher record with a set of good pictures showing the extent of the morphological variability seen in this species.
I will eventually submit the LSU sequence to GenBank. The ribosomal genes get published right away, which is not the case with protein-coding loci. My TEF-1 submissions from May are still MIA, though I have GB accession numbers for them.

Seems reasonable, if not altogether predictable
By: Logan Wiedenfeld (LoganW)
2018-12-04 05:11:47 CET (+0100)

B. floridanus is so frustratingly variable. (I think Jason Bolin calls it “the chameleon bolete.”)These were growing not too far from a group of floridanus with the more characteristic red-orange pores and the wider mesh reticulum.

Sorry I didn’t catch this, Igor. At least you were able to add a good sequence to GenBank. Thanks again for the work you’re doing. It’s fascinating to watch.

DNA sequencing results & discussion
By: I. G. Safonov (IGSafonov)
2018-12-04 04:23:21 CET (+0100)

A contiguous but slightly noisy (in the 3’ end) nrDNA sequence of 999 bps was obtained from this collection by Dr. Kudzma. It consists of the last 33 pbs of the ITS2 sublocus and the first 966 characters of nrLSU. There are no ambiguous characters; it’s a single haplotype.
A BLASTn search of the 857 bps fragment (between ITS6 and LR5 primers) gave Boletus floridanus voucher BD368 (HQ161859) as the top hit at 99.6% similarity (826/829). This collection was made by Dr. Bryn Dentinger in Costa Rica. There are no other LSU sequences of B. floridanus in GenBank. Dr. Dentinger’s voucher was also sampled for 4 other loci, including ITS and RPB-1. Other than these 5 accessions, floridanus is represented in GB by only two other ITS sequences. B. floridanus Singer was transferred first to Exsudoporus by Vizzini et al. in 2014 and then to Butyriboletus by Wu et al. in 2016.
A sample cladogram was build in GenBank to probe for phylogenetic inferences. Several accessions of Exsudoporus frostii sit on the adjacent branch. I think that proposing B. floridanus for this collection is reasonable.

The flavor
By: Logan Wiedenfeld (LoganW)
2018-06-21 05:08:20 CEST (+0200)

is acidic, tart. The odor is mild. I don’t trust my nose, however. It apparently has a limited range.

Re rubriflavus
By: I. G. Safonov (IGSafonov)
2018-06-21 04:34:31 CEST (+0200)

I did the same and even thought briefly about proposing it. :-)
Looks like, Logan, it could be unique to your area, and this obsie appears to be your first post of this species.
Did you record the odor and taste?

I did …
By: Logan Wiedenfeld (LoganW)
2018-06-21 03:46:42 CEST (+0200)

… my best to stuff it into A. rubriflavus, but alas, it was not accommodating. That was my only lead.

And you’re right. Somehow I forgot to note the reticulation. I saw it, just flubbed the description.

Very nice, Logan
By: I. G. Safonov (IGSafonov)
2018-06-21 03:14:17 CEST (+0200)

A striking, impressive bolete. I hope a sample is available.
In your description you left out an important detail — the stipes are reticulate. This species is neither B. luridellus nor A. rubriflavus. I don’t have any leads on a possible generic placement.

Created: 2018-06-21 02:46:58 CEST (+0200)
Last modified: 2019-06-26 05:21:29 CEST (+0200)
Viewed: 151 times, last viewed: 2019-07-05 00:43:12 CEST (+0200)
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