Observation 136187: Gymnopus subsulphureus (Peck) Murrill

Growing in a mixed forest, on and around a rotting log. The group in the first picture was growing from beneath a thick layer of debris; the stems were shorter in fully exposed mushrooms.

Caps yellow-brown to brown, everything else yellow. Stem becomes hollow, doesn’t break when bent. Thick, white rhyzomorphs. Flesh watery. Odor none. Taste indistinct, fungal.

Spores 5-6 × 3-3.5.

No violet reaction with KOH; eliminates Callistosporium.

Species Lists


Hyphae from gill edge.
Hyphae from pileipellis.

Proposed Names

28% (1)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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wow, Sava!
By: Debbie Viess (amanitarita)
2013-06-13 11:32:02 CDT (-0400)

Nice find, whatever it turns out to be.

Always possible
By: Irene Andersson (irenea)
2013-06-13 03:17:43 CDT (-0400)

that you have found something that isn’t present in the Gymnopus keys.

Peck’s description could cover this one too, but this is further west and might well be another. I wouldn’t care too much about how the smell is described though. I have noticed that collections of other species in the dryophila group can smell different depending on where they have been growing, particularly strong (pleasant but soon fading) if they have grown on not too rotten wood.

Peck named it
By: Sava Krstic (sava)
2013-06-13 02:45:58 CDT (-0400)

Maybe he didn’t think it was “sulphurea” enough? His description doesn’t seem to correspond perfectly to what we’re seeing.


By: Irene Andersson (irenea)
2013-06-13 02:31:39 CDT (-0400)

Good descriptions and micro shots are always helpful!

I had to find out why it’s named SUBsulphureus when there is no sulphureus… but if I got it right, there once was one Collybia sulphureus, which probably is a variety of Tricholoma sulphureum today :-) It makes sense with the similar colours.

Excellent observation!
By: Christian (Christian Schwarz)
2013-06-13 00:39:48 CDT (-0400)
Thanks, Martin and Irene
By: Sava Krstic (sava)
2013-06-13 00:12:45 CDT (-0400)

Irene, I knew you would put a name on my mystery “Collybia” as soon as you see it. :)

Nice work Sava and Irenea!
By: Martin Livezey (MLivezey)
2013-06-12 07:33:35 CDT (-0400)

Created: 2013-06-12 03:49:06 CDT (-0400)
Last modified: 2013-06-13 00:13:15 CDT (-0400)
Viewed: 93 times, last viewed: 2018-01-11 12:23:56 CST (-0500)
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