Notes:
The only puzzling thing here is that X. campanella is supposed to grow on conifers almost exclusively, and the only large trees around here are cottonwood. So either the log came from somewhere else, or X. campanella can grow on cottonwood, or this is not X. campanella. But it looks like one, microscopically too, from what I’ve looked on. Spores 7-8 × 4 microns, chelocystidia OK, clamps. No taste, odor yes, but hard to describe other than “mushroomy”.

Images

Gray card below, for color accuracy.

Proposed Names

46% (2)
Recognized by sight: out of its “normal” range but habitat is right.
28% (1)
Used references: Aldrovandi et al, 2015: “The Xeromphalina campanella/kauffmanii complex: species delineation and biogeographical patterns of speciation” – https://www.ncbi.nlm.nih.gov/pubmed/26297781
56% (1)
Recognized by sight

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= Observer’s choice
= Current consensus

Comments

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X. campanella indistinguishable from X. enigmatica without mating studies or DNA
By: Jacob Kalichman (Pulk)
2017-12-14 12:17:26 PST (-0800)

Xeromphalina campanella can be distinguished from X. enigmatica only by mating studies or DNA sequencing. They’re effectively identical in macroscopic features, microscopic features, chemical features, geographic location, and substrate preference.

Foreign log
By: Ruzica and Sava Krstic (ruzasava)
2012-04-02 20:56:41 PDT (-0700)

The log is 100-200 m from the beach, but the area is flat with parts free of large trees, so it seems possible that a flood brought it.

flood debris
By: BlueCanoe
2012-04-02 09:18:17 PDT (-0700)

Could this log have been brought to Sauvie Island during a large flood? That could explain a conifer log amongst cottonwood trees.

Irene
By: Ruzica and Sava Krstic (ruzasava)
2012-04-02 08:43:14 PDT (-0700)

The spores in the micrograph may look green or whatever, there’s no way I can faithfully reproduce colors there. But the spore print (last photo) with two drops of Melzer’s on it looks brown to me.

Looks green to me
By: Irene Andersson (irenea)
2012-04-02 02:27:13 PDT (-0700)

so I’d call it amyloid.

Is this amyloid?
By: Ruzica and Sava Krstic (ruzasava)
2012-04-02 00:44:23 PDT (-0700)

The spores are supposed to be amyloid in every Xeromphalina. What I got, however, looks more like dextrinoid. (Added photo of the spore print.)