Observation 74008: Ganoderma oregonense Murrill
When: 2011-08-13
No herbarium specimen

Notes: Found at Mora campground entrance on rotten Western Hemlock logs. This saprophytic fungi has evidently broken down this canopy to a dark brown pulp for multiple seasons I hypothesize. Most logs crumbled easily when disturbed, and along with evidence of multiple old specimens from prior seasons I can see how effectively this fungus breaks down lignin rich materials.

Measurements of spore bearing structures revealed 3 pores per mm- indicating them to be G. oregonense and not G. tsugae(which has 4-6 pores per mm).

Temp: low 70’s sunny- with constant precipitation from nearby Rialto beach ocean spray.

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Western Washington
By: ndoll
2011-08-16 20:39:31 PDT (-0700)

There are four independent species representing the lucid Ganoderma concept in western Washington. Those are: Ganoderma lucidum, G. oregonense, G. resinaceum, and G. tsugae. With plenty of practice each can be distinguished by just observing macroscopic features.

The pore density for Ganoderma tsugae measures 4-6(7) per mm. The pores on your photo (162842) measure 3-5 per millimeter and that suggests G. lucidum (sensu lato), and it is growing from conifer wood.

To complete your identification, add a photo of the material dissected in half to illustrate the interior context. If the context is whitish it is Ganoderma tsugae. If its interior context is brownish it is G. lucidum.

Good eye Ndoll-
By: Drew Henderson (Hendre17)
2011-08-16 16:52:21 PDT (-0700)

You’re totally correct- I looked again and there are a few spots where there are 4-5 per mm. This is evidently G. tsugae (fruiting from a Tsuga heterophylla).
Thanks for the close inspection- much appreciated :)

Washington state
By: ndoll
2011-08-16 16:28:14 PDT (-0700)

The pores measure 3-5 per 1 millimeter. This is not G. oregonese.

Created: 2011-08-15 13:01:09 PDT (-0700)
Last modified: 2015-09-13 22:48:09 PDT (-0700)
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