Observation 279439: Xerocomellus Šutara

When: 2017-06-18

Collection location: Olivette, Missouri, USA [Click for map]

Who: Judi T. (AvidAmateur)

No specimen available

A solitary specimen in grass under a mature Pin Oak at private residence. Cap: 7 cm., tubes 9 mm. deep. 1-2 pores per mm. Some light reddish stains around bug holes on pore surface. Stipe: 5 cm. X 1.4 cm., yellow at apex. Bruises blue instantly on pores, flesh, and tubes. KOH yellow on cap. Obtained an olive-brown spore print.


Copyright © 2017 Judi Thomas
Copyright © 2017 Judi Thomas
In situ
Copyright © 2017 Judi Thomas
Copyright © 2017 Judi Thomas
Copyright © 2017 Judi Thomas
Copyright © 2017 Judi Thomas
Copyright © 2017 Judi Thomas
Copyright © 2017 Judi Thoomas
Copyright © 2017 Judi Thomas

Proposed Names

-11% (2)
Used references: Kuo’s “Mushrooms of the Midwest”, MO observations
30% (2)
Recognized by sight

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

= Observer’s choice
= Current consensus


Add Comment
Thanks for the additional tips, Bill. All helpful:)
By: Judi T. (AvidAmateur)
2017-06-23 12:48:50 CDT (-0500)
X. intermedius is usually red as I find it…
By: Bill (boletebill)
2017-06-23 10:00:45 CDT (-0500)

…in CT when young and like all these boletes (in this group) after awhile the colors change. Also X. intermedius is often a bigger mushroom than say X. chrysenteron

By: I. G. Safonov (IGSafonov)
2017-06-22 21:43:57 CDT (-0500)

I cannot take the credit for the 3 tips — the authorship of those belongs to Bill Yule. I think Xerocomellus makes the best sense here. Also, I recall Renee Lebeuf’s examples of intermedius with red caps. This species has ribbed spores and once belonged in Boletellus. Hortiboletus is another possibility, but those boletes are generally smaller in size. Of course, there is always a possibility of something undescribed. If the specimen has been preserved, DNA sequencing could be an option if microscopy is inconclusive.

Thank you very much, Igot. Your 3 tips are
By: Judi T. (AvidAmateur)
2017-06-22 20:30:46 CDT (-0500)

very helpful … as usual:) I have looked at all the X chrysenteron, truncatus, and intermedius observations on MO. Almost 100% of those obs show specimens with very cracked, brown caps. One might think that age could account for that, but I have a hard time believing no one is finding any fresh specimens. So that remains a bit confusing to me, since my specimen is definitely a rosy red, no brown tones. I did see examples of the deeper tubes and less bluing, which I will watch for in the future. Dave’s observation 244357 of X intermedius and the comments therein was most helpful … and is one of the very few Xerocomellus that look anything remotely like my observation. So many unanswered questions remain for this genus apparently. Thanks again for your help; your tips are a good start for me.

Judi, the things that rule out B. bicolor are…
By: Bill (boletebill)
2017-06-22 14:37:26 CDT (-0500)

!/ the relatively thick layer of the tubes…2/ the blueing of the flesh of the cut context…3/ the relatively large somewhat angular pores…Xerocomellus doesn’t have a lot of easily observed macro characters to separate it from similar red bolete genera but many of them are small with red caps and stipes and flesh that blues and large pores for a little mushroom. I hope that helps. Take a look at observations on MO for Xerocomellus chrysenteron and X. truncatus to get a feel for what (if anything) a Xerocomellus looks like. Hope that helps

Gentlemen, I’m certainly pleased to have all of you
By: Judi T. (AvidAmateur)
2017-06-22 12:25:35 CDT (-0500)

Boletaceae experts looking at my ob. I can’t find much helpful information about the macro-features of Xerocomellus in any of the books I have (including Bessette’s “North American Boletes”) or online. The MO observations of Xerocomellus seem to be “all over the place” from the standpoint of appearance and none (with the possible exception of observation 194699 ) seem to resemble the characteristics of my specimen, especially (but not only) the cap color … rosy red vs the brownish-red to brown of Xerocomellus.

Can any of you enlighten me as to how to tell the difference, in the field, between Baorangia and Xerocomellus, or is it just that the rapid bluing of my specimens ruled out Baorangia? Seems as if there is still lots of work to be done on the Xerocmellus genus to sort things out.

Thanks for any specifics you can provide.

Blues awfully fast for bicolor.
By: Scott Pavelle (Scott Pavelle)
2017-06-21 21:04:12 CDT (-0500)

For the record, I hereby object to anyone calling that a “species”. It’s got to be at least half a dozen, right? The entry for “bicolor group” seems a lot more fair.


For sure, Martin. I was lucky to get the
By: Judi T. (AvidAmateur)
2017-06-21 20:18:16 CDT (-0500)

spore print before the maggots devoured the entire cap overnight!

Judi – This one is very buggy!
By: Martin Livezey (MLivezey)
2017-06-21 19:53:30 CDT (-0500)

Created: 2017-06-21 18:47:01 CDT (-0500)
Last modified: 2017-06-22 17:45:49 CDT (-0500)
Viewed: 150 times, last viewed: 2019-08-19 17:12:40 CDT (-0500)
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