Observation 115587: Collybia tuberosa (Bull.) P. Kumm.

When: 2012-11-03

Collection location: Mount Pisgah Arboretum, Lane Co., Oregon, USA [Click for map]

Who: David Rust (incredulis)

No specimen available

Part of display at Cascade Mycological Society mushroom festival. Identifiers included Susie Holmes, Bitty Roy, Steve Trudell, Debbie Viess, Freeman Rowe, Erin Page Blanchard, Joe Spivack and others from CMS.

Proposed Names

45% (2)
Recognized by sight: Lack of sclerotia, copious mycelial threads, growing from needle duff rather than directly from blacked Russulaceae.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I understand.
By: Debbie Viess (amanitarita)
2012-11-04 21:36:18 CST (-0500)

I just don’t see that those particular threads are attached to anything, and they seem awfully large for the tiny caps shown. Lots of fungal mass in that hall, randomly scattered, perhaps.

I wish there was more info or a photo of the complete mushroom. I have to go with the person who had it in hand and made the determination…they probably did look at the stipe base, even tho we can’t.

Yes, Fair ID: a quick and dirty ID when you have too many mushrooms to process in too little time.

Can’t nail them all, esp. from once removed.

Hi Debbie!
By: Eric Smith (esmith)
2012-11-04 17:31:41 CST (-0500)

The mycelial threads aren’t “random”, but rather a branching of the stem base; a feature not typically seen in C. tuberosa. You’re right, this feature alone cannot ID it to species as C. cookei can have the same/similar structure. I don’t know if that occurs in Oregon.


I have no idea what a “typical Fungus Fair ID” is. The only one I’ve ever been to was Kerhonkson 2010; where we briefly met. If you mean it was ID’d in passing, then I can wholeheartedly identify with that.

I see where you are going here…
By: Debbie Viess (amanitarita)
2012-11-04 11:30:27 CST (-0500)

not sure who IDed this or what criteria they used or whether there was initially the “smoking gun” of a rotten fungal substrate.

Without that information, it could be either of these species (both occur in the area). Random mycelial threads aren’t enough to ID to sp., though, and none of the bases are exposed to prove or disprove the presence of sclerotia.

Pretty typical for Fungus Fair IDs though. I’m sure you know how that is.

Created: 2012-11-03 22:40:26 CDT (-0400)
Last modified: 2012-11-04 11:30:41 CST (-0500)
Viewed: 49 times, last viewed: 2017-10-26 22:48:54 CDT (-0400)
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