Notes:
Growing on old standing dead tree @ ~ 6000 ft.
Cap 18.5 cm across.
Spores ~ 12.0-15.0 X 7.0-8.2 microns.
Q(range) = 1.67-1.90.
Q(avg) = 1.76
Basing ID on “California Mushrooms” reference which says G. tsugae can grow on Red Fir and the spores are narrower for G. tsugae vs G. oregonense(7.5-8.5 vs 8-10).
Not sure of the host tree here but red fir is a good possibility.

Images

Proposed Names

15% (2)
Used references: California Mushrooms by D. Desjardin, Michael Wood & Frederick Stevens
60% (2)
Recognized by sight: Spore size more closely matches G.oregonense where G.tsugae has smaller spores approx 9.5 × 6.5 µm
Based on microscopic features: Spores

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= Observer’s choice
= Current consensus

Comments

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I’m not sure what the host tree
By: Ron Pastorino (Ronpast)
2017-10-01 20:57:20 CDT (-0400)

was. At that elevation and being surrounded by conifers, I’m pretty sure it was originally a conifer.
I think I did save a portion of it if it is of interest.

Tree host
By: Matthew Schink (MSchink)
2017-09-28 07:09:12 CDT (-0400)

Is it possible it was found on a hardwood? Or was it for certain a conifer?

Spores.
By: Matthew Schink (MSchink)
2017-09-28 07:07:13 CDT (-0400)

Spores for G.tsugae are smaller over all, at around 9.5-10 × 5-7µm on average. I have never seen a specimen from the West coast that matches this.