Observation 77986: Bondarzewia occidentalis Jia J. Chen, B.K. Cui & Y.C. Dai

When: 2011-09-29

Collection location: Tioga Rd., Yosemite National Park, California, USA [Click for map]

Who: David Rust (incredulis)

Specimen available

massive brown and white polypore, on ground (probably on wood). Tomentose cap surface; honeycomb on pore surface – not turning brown when scratched.
found in Red Fir mixed conifer forest. YNP2111

Proposed Names

2% (7)
Recognized by sight: that soft fuzzy margin
31% (3)
Recognized by sight: growth on ground, convoluted multipileate appearance
56% (1)
Recognized by sight: New name for the Western North American “Bondarzewia mesenterica”, which is not the same as the European species.
Used references: Chen, J., Cui, B., He, S., Cooper, J. A., Barrett, M. D., Chen, J., … & Dai, Y. (2016). Molecular phylogeny and global diversity of the remarkable genus Bondarzewia (Basidiomycota, Russulales). Mycologia, 108(4), 697-708.

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= Observer’s choice
= Current consensus


Add Comment
By: damon brunette (damonbrunette)
2011-11-18 19:06:56 PST (-0800)

both of those ARE I resinosum. But the pore surface is much deeper, not to mention that its growing on wood.

By: Debbie Viess (amanitarita)
2011-11-17 14:31:02 PST (-0800)

if we could just find it, the ID question could be easily answered! ;)

I, too, have never seen young material of Bondarzewia. Next time we come across one of these ambiguous polypores, I’ll check for latex in the field.
It does look like the lumpy specimen that you found and linked to, Thea.

Looks more like Bondarzewia to me…
By: Thea Chesney (thea)
2011-11-17 14:10:47 PST (-0800)

The multipileate appearance and growth on the ground (probably from roots) make it seem more like Bondarzewia mesenterica, at least like the ones I’ve seen. It looks a lot like one I found earlier this year, which I thought at first glance might have been Abortiporus biennis. It did have fuzzy cap surfaces! I’ve never seen Ischnoderma resinosum growing on the ground, and I think it’s usually a darker brown.
observation 76212 doesn’t have great photos, unfortunately, but the description seems to match this one pretty well.
The spore ornamentation on Bondarzewia is unmistakable (amyloid warts/spines, just like Russula) so if there is a way to get this one under a microscope, that would settle it.

Bondarzewia mesenterica might be possible
By: Tom Bruns (pogon)
2011-11-17 11:15:17 PST (-0800)

I’ve never seen it young (is it fuzzy?), but that is mulitpileate like this and and about the right color. I suppose the specimen is stashed in my office somewhere, in which case it can be added to my guilt list of things that need to be looked at.

By: Debbie Viess (amanitarita)
2011-11-17 10:21:31 PST (-0800)

if this isn’t I. resinosum, then these two prob. aren’t either:




there is variability in the pore surface.

Please blow up the photo, look at the pore
By: damon brunette (damonbrunette)
2011-11-17 09:55:22 PST (-0800)

Surface before voting I resinousum May not be abortiporus, but not ischnoderma.

no bruising
By: David Rust (incredulis)
2011-10-05 07:45:49 PDT (-0700)

It did not bruise reddish or brown on the pore surface. I don’t think it’s Abortiporus biennis.

Created: 2011-10-04 10:52:56 PDT (-0700)
Last modified: 2017-02-15 20:28:19 PST (-0800)
Viewed: 196 times, last viewed: 2019-03-20 20:05:19 PDT (-0700)
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