Observation 73783: Xanthoconium purpureum Snell & E.A. Dick
When: 2011-08-10
No herbarium specimen
0 Sequences

Tightly wrinkled/pitted cap surfaces direct one to “hortonii.” But the gestalt of these mushrooms brings Xanthoconium to mind… pale tannish yellow pores, streaky stipe. A few times in the past, I have found what I had beieved to be a rugose form of X. affine. But maybe these were B. hortonii?

Proposed Names

-34% (3)
Used references: B/R/B
-18% (2)
Recognized by sight
Based on chemical features: KOH on cap produced nothing in the ballpark with “olive brown.” Just a darkening of the reddish ground color.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Rugose caps
By: I. G. Safonov (IGSafonov)
2011-08-11 18:40:01 CDT (-0400)

Overall, this mushroom fits the description of X. purpureum very well, but I’ve never seen it with such a finely corrugated cap, which is not a characteristic mentioned in the big bolete book. Perhaps this variety should be aptly called “X. purpureum var. corrugis”. :-) See obs. #25158 for a more typical-looking example of X. purpureum. I’m sure that there exist several examples of hitherto undescribed Xanthoconium taxons posted on MO that clearly deviate morphologically from the standard types presented in B-R-B — for example, see obs. #25175.

Thanks Walt.
By: Dave W (Dave W)
2011-08-11 08:39:45 CDT (-0400)

Yeah, the color…! Other examples of rugose Xanthoconium I’ve seen have been light brown.

Created: 2011-08-11 03:50:41 CDT (-0400)
Last modified: 2011-08-15 15:29:12 CDT (-0400)
Viewed: 147 times, last viewed: 2017-06-09 19:58:04 CDT (-0400)
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