Observation 202922: Ganoderma oregonense Murrill

On fallen Alnus rubra(deciduous)-NOT ON CONIFER. Completely flattened and dense in context.
Water rubbed on cap to reveal beautiful lacquer appearance. Underside dry.

Older specimen from last summer fruiting. Perfectly round and zonate, thin bodied, sessile – not pithy(as With G.oregonense) fruiting on hardwood in riparian zone.

Herbarium specimen-dried, available at one of my Olympia, WA locations.

Elevation: Sea level.

Temp: mid 50’s.

4 pores per mm.

Species Lists


Note flattened, layered zones on margin similar to G.polychromum.

Proposed Names

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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For sure Matthew-
By: Drew Henderson (Hendre17)
2015-04-19 11:43:04 AST (-0400)

Agreed that this will most likely end up being a G.oregonense… Visiting my friend Jay in Oly in two weeks- we will possibly slice off a side/cross section to clear things up.

Thanks again for the continued help and obsession with the Ganoderma!

Thanks again to Alan Rockefeller, as well, for the continued expertise and direct guidance. You are such an asset to the world of mycology Alan!

We’ll get this one nailed down soon enough ;)



Alan’s proposal is probably a safe bet.
By: Matthew Schink (MSchink)
2015-04-19 04:19:42 AST (-0400)

To determine if it is G.polychromum, you will need to slice it open, the flesh will of course be whitish in G.oregonense. With G.polychromum the flesh will be brown, usually if not always with concentric darker bands. I was sent one sample from Oregon, which from the photos I thought looked like oregonense even through it was on hardwood, but when I cut it open there was that tell tail brown. There also seems to be a band of yellow directly underneath the skin in all specimens I have been sent, usually most prominent in the stipe. Appears to be a yellow resin coating the hyphae. Just about nothing is known about G.polychromum though and I am basing the application of the name off from the original description by Murrill and a few comments by Steyaert. Steyaert considered it synonymous with G.resinaceum, but the DNA indicates G.resinaceum is restricted to the old world. I have not sent my polychromum cultures out to be sequenced yet.

Very cool data point though if this turns out to be oregonense. I have had a feeling for a while that Ganoderma is not as restricted to its hosts as previously thought. I have found G.“applanatum” on both hardwoods and hemlock for example.

Hey Matthew-
By: Drew Henderson (Hendre17)
2015-04-17 21:06:44 AST (-0400)


I wish we lived closer by my brother… I would love to get a sample of this baby from my friend Jay who currently has it at his home herbarium in Olympia, WA. If you want to take a look- it had 4 pores per mm underneath, was fruiting on big leaf maple and was thin and sessile, vertically stalked. Should we place it in the G.polychromum for now? Feel free to vote either way, I totally trust all input you have and hope to get this nailed down :)

Happy hunting back East this season – may you fill many bags with Morels and Reishi!



Very interesting.
By: Matthew Schink (MSchink)
2015-04-17 20:24:53 AST (-0400)

It certainly looks like G.oregonense from the outside!Ganoderma on hardwood in Washington may be G.polychromum. I did get a sequence from a California collection that was very close to G.lucidum sensu stricto though. I was not able to get a large enough sample to do any meaningful study though. The sample I was sent was just big enough to send off for sequencing. Very cool.

One interesting thing to note about the conifer Ganoderma, G.tsugae on the east coast has occasionally been found on hardwoods, usually birch, but I have one report of it on maple. And in the southeast there are two closely related Ganoderma G.curtisii and G.meredithae, with curtisii being on hardwood and meredithae being on pine. I can find no morphological differences and am waiting on DNA. But I suspect it may be one species that can grow on either, or perhaps a species in the process of splitting into two. G.sessile (G.resinaceum s.l.), typically found on hardwoods can also be found rarely on conifer, I also eagerly await the DNA results of a specimen found on Juniper.

Created: 2015-04-17 15:14:33 AST (-0400)
Last modified: 2015-04-19 12:04:04 AST (-0400)
Viewed: 147 times, last viewed: 2018-01-16 00:51:25 AST (-0400)
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