Observation 9128: Tricholomopsis rutilans (Schaeff.) Singer

Displayed at the 2003 Oregon Mycological Society Fall Mushroom Show, held at the World Forestry Center, Portland, OR. Specimens with OMS tags have herbarium number.



Proposed Names

25% (3)
Used references: Identification by Dr. Lorelei Norvell
63% (4)
Recognized by sight: I see a little bit of purple

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Tricholomopsis in ARORA
By: Andreas Gminder (mollisia)
2009-06-09 16:40:47 CDT (-0400)

yes, I agree. But using ARORAs Mushrooms demystified, there is also no other choice as for T. rutilans – IF one accepts the purplish hue in the caps of some of them.

Thanks for explaining
By: Irene Andersson (irenea)
2009-06-09 16:25:46 CDT (-0400)

- both Daniel and mollisia (Andreas?)
I agree that all three would have been called rutilans in Europe, but there are apparently more species to choose from in North America.

T. rutilans vs. T. sulphuroides
By: Daniel B. Wheeler (Tuberale)
2009-06-09 15:34:58 CDT (-0400)

The difference(s)? T. rutilans is typically terrestrial or on buried wood (hardwoods mostly, I believe). T. sulfureoides is quite rare (in my area), usually a heartwood decomposer of old-growth conifers such as Western hemlock, Douglas fir or Noble fir; and is so brighly yellow colored it resembles a neon yellow light, even in the dark old-growth forests I have found it. Here in the PNW we have almost no old-growth forests anymore, and we seldom have much heartwood until a tree is over 50 years old. For a Douglas fir, a 50-year-old tree could be 2+ feet in diameter and well over 100 feet tall. I have collected T. rutilans many many times (most years), but collected T. sulphuroides only twice.

According to David ARORA
By: Andreas Gminder (mollisia)
2009-06-09 15:29:48 CDT (-0400)

ARORA comments: “[…] Finally, there are several entirely yellow species also found on rotting conifers, including T. flavissima, with a fibrillose, fringed cap margin; and T. sulfureoides, partial to Hemlock, with an evanscent veil, and a cap that develops small brownish scales and streaks in age.”
So in my opinion this would mean, that T. flavissima should have a completely yellow cap without any other coloration nor scales, and that T. sulfureoides has a yellow cap which gets brownish scales and streaks. Both descriptions don’t seem to fit too good to the shown pictures #8881 and #17581.
But please keep in mind that I have no own experience with the American fungus flora, nor that I did suggest the name T. rutilans for those pictures. But if they were from Europe, all would have to be called T. rutilans.

What’s the difference
By: Irene Andersson (irenea)
2009-06-09 14:55:46 CDT (-0400)

between this and obs 8881, named Tricholomopsis flavissima?

- and for that matter, obs 17581, named Tricholomopsis sulfureoides..?

purplish tint
By: Andreas Gminder (mollisia)
2009-06-09 14:44:33 CDT (-0400)


perhaps I did not express myself good, so sorry for the linguistic deficits I have. I did not mean that the fungi shown have purplish scales, but that they have a faint purplish coloration, a hue of purple in the cap colour. It is well visible for me in the left specimen (which is only seen half) and at the specimen which the name plate is touching, in both cases in the middle of the cap. Be it as it is, you are perfectly right, we do know quite few of the species which are outside there and wait to be discovered :-)

No certainty …
By: Daniel B. Wheeler (Tuberale)
2009-06-09 12:01:32 CDT (-0400)

Dr. Norvell has stated the Pacific Northwest probably hosts some 1.5 million species of fungi, only 10-15% of which have ever been identified in science to date. Ergo, there is ALWAYS the possibility of this being something different. I am not a professional mycologist (sorry!), and have never studied the European mycoflora. Therefore I have no opinion as to what this collection actually is.

Thank you for your comment, mollisia! I have re-examined the photo, and personally do not see the purplish scales you mention. Perhaps others do though, and this specimen will get the further attention many fungi deserve.

Not decora ss. auct europ.
By: Andreas Gminder (mollisia)
2009-06-09 08:47:32 CDT (-0400)

Although I kow about the great mycological experience of Daniel Wheeler as well as Dr. Norvell, I dare to reject that determination. T. decora is a citrin species with dark olive-blackish scales on the cap and which has never (really never!) any purple tints. This foto shows either a pale form of T. rutilans or (if on hardwood) T. ornata (not accepted by all mycologists, but I think it is a good species) or a T. species not known in Europe. But it is not the T. decora we know from the mountainous areas in Europe.

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