Observation 221441: Gymnopilus ventricosus (Earle) Hesler


Collector: unknown
In soil, location unknown
Taste: bitter
Cap diameter: 6 cm
Flesh: yellow, 1 cm in center
Stipe: length 10 cm; width 2-2.5 cm
Micro: spore size 10×6 µm no germ pore
Determiners: Erin Page Blanchard, Joe Cohen


Copyright © 2015 Dick Bishop
Screen Shot 2015-11-02 at 09.14.36.png

Proposed Names

27% (3)
Used references: Gibson, Matchmaker: Mushrooms of the Pacific Northwest, Version 2.2 (Apr. 2014) (application, latest version downloadable at http://www.svims.ca/council/matchmaker.htm)

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Same mushroom
By: Alan Rockefeller (Alan Rockefeller)
2015-11-04 21:39:31 EST (-0500)

various names. Lots of people continue to call it by the wrong name, including Mike Wood on Mykoweb. http://www.mykoweb.com/CAF/species/Gymnopilus_junonius.html. However G. junonius is a European taxon that is much smaller. Here is the original description, there are no other large Gymnopilus species that are in the Stanford University area. http://www.librifungorum.org/...

More confusion re G. spectabilis vs G. ventricosus
By: Joe Cohen (Joseph D. Cohen)
2015-11-04 09:05:23 EST (-0500)

The following information seems — on its face — inconsistent with Alan’s information. Can anyone help reconcile this data? (Pointers to free, on-line publications would be especially helpful.) Part of the answer may be that most of the info pre-dates the Hesler 1969 publication — to which I lack access — reclassifying Pholiota ventricosa as G. ventricosus.

In the US, there are many western US herbarium specimens which someone identified as G. spectabilis (though most are from the East). Collectors include Thiers, Zeller, Ammirati, Gruber, Desjardins, Zeller, Trappe, E. Cazares, A.H. Smith, Nancy Smith Weber, Paul Kroeger, Oluna Ceska. See here.

Genbank has 17 sequences listed under G. spectabilis but none listed for G. ventricosus.

Thank you!
By: Joe Cohen (Joseph D. Cohen)
2015-11-03 16:27:45 EST (-0500)

Thanks for taking the time to propose the name and for sharing your knowledge about about the staining. That certainly makes things easier.
I don’t remember any staining, and the photos show none.
We didn’t test hallucinogenic properties, and I doubt that we will do so. :-)
— Joe

We don’t get the Gymnopilus spectabilis group on the west coast
By: Alan Rockefeller (Alan Rockefeller)
2015-11-03 12:44:30 EST (-0500)

I recently reviewed all MO observations of this species, and all appear to be G. ventricosus. The G. spectabilis group is a bit smaller, stains blue and is hallucinogenic. The west coast ones never stain blue.

G. spectabilis gr. vs. G. ventricosus
By: Joe Cohen (Joseph D. Cohen)
2015-11-03 08:22:29 EST (-0500)

Alan’s suggestion of G. ventricosus is quite reasonable. Prompted by his suggestion, I again looked at MatchMaker to see if it could help figure out the best name to use here. Among other things, it says:
“other members of Arora’s G. spectabilis group have yellowish or ochraceous caps (as opposed to reddish-brown, minutely yellow-fibrillose to nearly bald), and stems are different from those of G. ventricosus described as 14-18cm long, radicating, and conspicuously ventricose.”
I have also attached a screen shot showing the differences in Matchmakers matching data — not characters — between these two concepts.
I have also added a closeup of the gills, kindly provided by Richard Bishop.
Dick has also done some supplemental microscopy, and says that most spores are about 10 × 6. (I added that info to the notes.) That’s within the range for G. spectabilis group, while outside — but very close to — the range for G. ventricosus.
I suppose it could be either.

Rusty brownish spore deposit
By: Joe Cohen (Joseph D. Cohen)
2015-11-01 22:57:17 EST (-0500)

Almost impossible to tell from my photo, but this has a rustyish brownish spore deposit, and a ring zone with that deposit. (This — plus not growing on wood — made one identifier at our fall show suspect that it might be Cortinarius.) You can see part of it on the right side of the stipe.
(So it can’t be Tricholomopsis rutilans.)

Created: 2015-11-01 19:35:51 EST (-0500)
Last modified: 2016-04-17 13:44:32 EDT (-0400)
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