Observation 25175: Xanthoconium Singer
When: 2009-08-06
No herbarium specimen

Notes: Here comes a mysterious bolete that roughly resembles a Xanthoconium sp. It was growing alone under hardwood trees, possibly oak. Standing at ~2.5" tall, it sports the most unusual reticulation I have seen in boletes, covering the entire length of the stipe. Another distinctive feature that might shed some light on the identity is a chemical reaction with KOH (pilepellis rapidly turns orange); the context is negative with KOH. X. affine var. reticulatum (A.H. Smith) Wolfe is a possibility, though I have never collected it. Also, MushroomExpert.com briefly mentions an elusive reticulated subtype of X. purpureum.

[admin – Sat Aug 14 01:59:21 +0000 2010]: Changed location name from ‘Chester, Morris Co., New Jersey, USA’ to ‘Chester, New Jersey, USA

Proposed Names

60% (2)
Eye3 Eyes3
Recognized by sight: Overall appearance, i.e., colors, shape, pore surface
Used references: “North American Boletes” by B-R-B

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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By: Dave in NE PA
2009-09-13 13:26:16 PDT (-0700)

I didn’t read the affine section. So maybe what you have here is an uncommon variety of X. purpureum?

Michael Kuo writes
By: I. G. Safonov (IGSafonov)
2009-09-13 09:12:13 PDT (-0700)

at the very bottom of the X. affine page: "Several varieties of Xanthoconium affine have been described. Xanthoconium affine var. maculosus is more or less identical but has a cap that is spotted with whitish or pale yellow spots—while Xanthoconium affine var. reticulatum has a conspicuously reticulate stem. However, I have collected similar reticulate and spotted “varieties” of Xanthoconium purpureum—supporting the idea that one variable species might account for Xanthoconium purpureum and all the varieties of Xanthoconium affine."

I could not find the comment on Mushroom Expert
By: Dave in NE PA
2009-09-13 09:03:57 PDT (-0700)

about the reticulate version of X. purpureum. Kuo mentions that an amonia induced green flash on the cap is a key to IDing purpureum.

Created: 2009-09-12 20:59:15 PDT (-0700)
Last modified: 2010-08-30 08:25:28 PDT (-0700)
Viewed: 87 times, last viewed: 2016-10-28 13:48:27 PDT (-0700)
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