When: 2009-06-26

Collection location: Larimer Co., Colorado, USA [Click for map]

Who: rob hallock (mycorob)

No specimen available

We found this in a prairie under Mountain Mahogany. There were no other trees around (for miles). Elevation around 6,700 feet above sea level, no more than a couple miles from the Wyoming border in North central Colorado.

Mushroom: clearly an Amanita in section Lepidella. Any assistance beyond that will be helpful. Our team collected all 3 specimens shown in the pics, and they will all eventually make it to our local herbarium.

[admin – Sat Aug 14 02:07:36 +0000 2010]: Changed location name from ‘Weld County’ to ‘Weld Co., Colorado, USA’


Proposed Names

37% (5)
Recognized by sight
17% (5)
Based on microscopic features: Microscope and DNA work by Evenson, Kropp and Baroni.
93% (3)
Recognized by sight: There is no valid combination called “Smithiomyces crocodilinus” The species was published as a new species and new genus, Cercopemyces. The species occurs under Mountain Mahogany
Used references: Cercopemyces crocodilinus, a new genus and species related to Ripartitella, is described from North America
Mycologia, 106(4), 2014, pp. 785–796. DOI: 10.3852/13-312
Timothy J. Baroni, Bradley R. Kropp, Vera S. Evenson, Markus Wilhelm

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

= Observer’s choice
= Current consensus


Add Comment
Inoculum – Smithiomyces
By: S. Redhead (Scott)
2015-02-16 06:32:39 MST (-0700)

Thanks Debbie. I should have noticed that. In any event – now it is corrected and we have a history recorded.

the only citation that I could find on the old name …
By: Debbie Viess (amanitarita)
2015-02-15 16:34:14 MST (-0700)

is this one, from the Inoculum:

Baroni, T. J.,(2011) Kropp, B. R., & Vera, E., Smithiomyces crocodilinus sp. nov. prov. an unusual agaric from semi-arid regions in the Rocky Mountains.. Inoculum (P8).

It has the same authors as for the Cercopemyces, but apparently the nom. prov. of Smithiomyces crocodilinus was never published. They wisely waited for the DNA, which showed NO relation to the proposed genus Smithiomyces, merely a similarity in spores. The kinda sorta macro match with Amanita wasn’t enough to tell the tale, either, but you gotta start out somewhere!

You can see where folks would take a wrong turn though, without ALL of this info at their disposal.

Here’s the quote from the results section of the cited C. crocodilinus paper on that decision:

“Although Cercopemyces crocodilinus originally was thought to be a species of Smithiomyces based mainly on basidiospore morphology, the nLSU-rpb1 (FIG. 1) and nLSU-ITS analysis (FIG. 2), both show that Smithiomyces mexicanus is unrelated to Cercopemyces.”

Now, how does one undo the damage caused by the use of a latin name prior to its actual publication?

The invalid name “Smithiomyces crocodilinus”
By: S. Redhead (Scott)
2015-02-14 07:47:22 MST (-0700)

I believe that this name was never published and that it should never have been listed. It now is embedded in the WWWW. If it was published please let me know. The genus seems to be Cercopemyces (2014), and the species Cercopemyces crocodilinus (2014).

modern description of S. mexicanus
By: else
2011-05-26 12:24:09 MDT (-0600)

and the article on it can be found at:

http://nature.berkeley.edu/brunslab/people/ev.html – scroll down till you get there:
vellinga 1999. An American in a Belgian swimming pool.

thanks Irene…
By: Debbie Viess (amanitarita)
2011-05-26 11:58:49 MDT (-0600)

that answers my question about who this genus was named after!

For the record
By: Irene Andersson (irenea)
2011-05-26 11:50:37 MDT (-0600)

One link to Mycologia (I hope it works):

and this is why…
By: Debbie Viess (amanitarita)
2011-05-26 11:30:41 MDT (-0600)

Dr. Tulloss always recommends checking the gill trama of these ambiguous “amanitas.” We have all been faked out, one time or another!

very cool, Else.
By: Debbie Viess (amanitarita)
2011-05-25 19:41:42 MDT (-0600)

any way that you could link to your paragraph on the type species of this genus?

Alexander Smith?

on Smithiomyces mexicanus
By: else
2011-05-25 18:39:18 MDT (-0600)

I only know the type species of the genus Smithiomyces, Sm. mexicanus, a species from Florida, Mexico etc. and introduced into greenhouses etc. in Europe. That is a totally different species, also white, with very crowded lamellae, a farinaceous smell, small rough spores and nests of round cells on the cap surface. I wrote a small article on the first find in Europe in the Mycologist (1999). Smithiomyces is close to Lepiota (based on morphology).

By: rob hallock (mycorob)
2011-05-25 17:56:54 MDT (-0600)

Good catch, it was Larimer country – my bad.

By: rob hallock (mycorob)
2011-05-25 17:47:55 MDT (-0600)

No more details until MSA …

By: BlueCanoe
2011-05-25 17:45:43 MDT (-0600)

Rob, are you sure the observation was located in Weld Co.? The press release mentions Larimer Co. Very cool to find a new species!

The original article
By: Christian (Christian Schwarz)
2011-05-25 17:10:50 MDT (-0600)

in Mycologia 36:366
states that the gill trama is regular, but is very vague about what set the spores apart, mentioning only that they are “of a size and shape which do not occur in Amanita”…

I just wrote Tim Baroni about this mushroom…
By: Debbie Viess (amanitarita)
2011-05-25 16:51:46 MDT (-0600)

maybe he will dish up some more details prior to the MSA poster session this summer.
guess that it was MR with mountain mahogany after all.

very cool Rob, and now you are a part of Myco-History! ;)

Thanks, Ron!
By: Tim Sage (NMNR)
2011-05-25 16:19:54 MDT (-0600)

Very cool stuff! I participated in my first Bioblitz last week, and it was a blast!

Real Interesting Rob
By: Ron Pastorino (Ronpast)
2011-05-25 15:40:14 MDT (-0600)
and here is more info for those us who never heard of Smithiomyces;.. http://www.fcgov.com/news/?id=3755
By: Christian (Christian Schwarz)
2011-05-25 14:26:04 MDT (-0600)

What do the spores look like, such that they are so different from Amanita?

Hi Rob! Thanks for posting these…
By: Debbie Viess (amanitarita)
2009-06-28 13:23:13 MDT (-0600)

do they still exist in a fresh form? sure would like to see the bulbous base more clearly, with that duff carefully removed…;)

interesting potential host, that mountain mahogany…OR maybe this is another one of those “hot” non-MR lepidellas??! not prairiicola (despite the location found) which has a rooting, narrow base…