Observation 160792: Pisolithus Alb. & Schwein.
When: 2014-03-05
No herbarium specimen
0 Sequences

Growing in the duff/leaf litter under cottonwoods and mesquite. We practically tripped over them as in this stage they blended into the duff. At first we thought they were stumps but upon closer examination we saw the brown spore dust and woody stem. I thought we’d be hard pressed to ID them is this condition but they are exactly as described by D. Arora.

Proposed Names

47% (3)
Recognized by sight: Found many clumps of these under cottonwood and mesquites near the side of a dirt road and abutting a wash.
Used references: Mushrooms Demystified page 712 and Kuo, M. (2006, November). Pisolithus tinctorius. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/pisolithus_tinctorius.html
62% (3)
Recognized by sight
3% (2)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I don’t know of any.
By: Daniel B. Wheeler (Tuberale)
2015-11-12 14:56:05 CST (-0500)

I’ve only heard of 2 species being in OR, and one of those was introduced. P. albus was added to the innocula mixture in southwestern OR to attempt to increase survival of seedlings, when P. tinctorius did not aid survival.

That reference
By: Byrain
2015-11-11 21:30:52 CST (-0500)

That reference seems to have not yet taken account that not all Pisolithus are P. tinctorius. Do you know of any Pisolithus sequences from collections associated with cottonwood that have been shown to match P. tinctorius collections associated with pine or oaks? I haven’t seen any, but I would be interested in finding out!

You mean besides everybody?
By: Daniel B. Wheeler (Tuberale)
2015-11-11 20:52:03 CST (-0500)
According to who?
By: Byrain
2015-11-11 20:20:14 CST (-0500)

Check out the reference in the name proposal, it seems P. tinctorius sensu stricta (And presumably P. arhizus too?) are only found with pine and oak.

By: Daniel B. Wheeler (Tuberale)
2015-11-11 19:39:28 CST (-0500)

is one of the 35 known host species of Pisolithus arhizus,

No Oaks or Pine
By: Byrain
2015-11-11 00:48:26 CST (-0500)

Cottonwoods and mesquite instead, probably not the “P. arhizus group”.

By: Terri Clements/Donna Fulton (pinonbistro)
2014-03-06 16:20:12 CST (-0500)

if/when I find these again in this condition, how would I prepare them for study and what parts would you need? They are quite large, partially desiccated and covered in tons of brown spores.


American species
By: Noah Siegel (Noah)
2014-03-06 10:50:04 CST (-0500)

are diverse, but we have been happy applying the name Pisolithus arhizus/tinctorius to ANY Pisolithus we find. (arhizus and tinctorius appear to be different species). This group needs work…

There are also at least two species introduced from AU growing with Eucalyptus in CA.

While European species of Pisolithus
By: Daniel B. Wheeler (Tuberale)
2014-03-06 10:37:21 CST (-0500)

seem somewhat diverse, American species seem limited to just the one species. I don’t think it matters much whether it’s called tinctorius, arhizus, or arenarius.

Sorry, Noah
By: Terri Clements/Donna Fulton (pinonbistro)
2014-03-05 22:01:14 CST (-0500)

we didn’t keep them. I definitely will next time though and send them to you.


Did you collect them?
By: Noah Siegel (Noah)
2014-03-05 21:46:59 CST (-0500)

There are many different species hiding out under the name Pisolithus arhizus.

I would be interested in a collection if you have it.

Created: 2014-03-05 21:28:51 CST (-0500)
Last modified: 2015-11-12 14:53:25 CST (-0500)
Viewed: 127 times, last viewed: 2017-06-18 01:22:56 CDT (-0400)
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