Observation 182676: Ganoderma P. Karst.

When: 2013-10-10

Collection location: Hayden, Idaho, USA [Click for map]

Who: Earl (EGLunceford)

No specimen available

This mushroom was found in the Fall of last year on a rainy day in dense forest. The mushroom was growing on an unknown dead stump. I have never seen anything like it since. I thought at first that it somewhat resembled a Ganoderma, but I have no clue. I wish I had a pic of the gills. I think they were a pale color. it was really quite a rubbery textured mushroom, and very rigid and dense too. I believe this mushroom to be an annual.



Proposed Names

31% (2)
Recognized by sight
42% (3)
Recognized by sight: really doubtful that it has gills rather than pores
47% (4)
Recognized by sight

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= Observer’s choice
= Current consensus


Add Comment
By: Matthew Schink (MSchink)
2014-11-21 11:16:20 AST (-0400)

Can be highly variable, it could be genetic or environmental. Given the location and substrate I think this is most likely Ganoderma oregonense.

River Dweller
By: Earl (EGLunceford)
2014-11-21 00:54:39 AST (-0400)

I’m surprised that you are so convinced that this is Ganoderma. Its actually exciting to me. The toothed margin and the flatness of the mushroom really throw me off.

By: Britney Ramsey (Riverdweller)
2014-11-08 10:37:27 AST (-0400)

This is definitely Ganoderma even without the pore shots.

By: Earl (EGLunceford)
2014-10-15 15:15:21 AST (-0400)

I stand corrected in saying that the mushroom had gills. I was only trying to reference its hymenium and used improper terminology. I’m certain that they were porous. And to narrow down the mushroom’s substrate, it could have been growing on: Hemlock, Grand fir, or W. Red Cedar.

By: Danny Newman (myxomop)
2014-10-15 02:59:53 AST (-0400)

The information you’ve provided here does not permit a more specific ID than the one I’ve made (and it’s a class, not a species). That you claim this to be gilled, despite looking much like a conk from the sole image, further complicates the identification you seek, as does the somewhat contradictory description of the texture as “quite rubbery” yet “very rigid and dense.” The fertile surface is essential in identification of fungi. See the following link for more information:


By: Earl (EGLunceford)
2014-10-14 04:07:20 AST (-0400)

Agromycetes isn’t a species though, right? could you please provide something more precise. I don’t have a lot of faith in that ID
I totally appreciate you looking at it though and trying!