Observation 26780: Lactarius aurantiosordidus Nuytinck & S.L. Mill.

Proposed Names

57% (1)
Recognized by sight: orange zonate cap; greens; latex dark green not orange.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Sensu CA
By: Noah Siegel (Noah)
2013-12-03 18:24:44 CET (+0100)

yes, but there is another deliciosus var olivaceosordidus out there…

is this a synonym…
By: Debbie Viess (amanitarita)
2013-12-03 18:18:55 CET (+0100)

for deliciosus var olivaceosordidus?

This was recently described
By: Noah Siegel (Noah)
2013-12-02 18:08:56 CET (+0100)

as a new species. The type was from Redwood NP near Orick. It’s the most distinctive “deliciosus” in CA. It’s easily told by its small size, dingy orange-brown latex, drab olive-orange color. Young caps can sometimes be all blue-green.

what has changed…
By: Debbie Viess (amanitarita)
2013-12-02 18:02:59 CET (+0100)

about your understanding of these sp?

one way or another.
By: Debbie Viess (amanitarita)
2011-12-27 18:31:20 CET (+0100)

I’ll be combing those Sitka spruce stands next fall myself.

that i can share…
By: Noah Siegel (Noah)
2011-12-27 04:55:07 CET (+0100)

not yet. You will have to wait for it.

By: Debbie Viess (amanitarita)
2011-12-27 03:22:32 CET (+0100)

I have never spent much time in the Sitka spruce forests of N. CA.

Got photos of this variety that you can share?

By: Noah Siegel (Noah)
2011-12-27 01:19:01 CET (+0100)

variety is really common in northern CA in the Sitka Spruce zone, starting in Casper and going up the coast.

The flesh colors repeated in Phillips are from a single collection by Smith; its more variable then what he reported, turquoise to bluish on caps that are greenish, at least in the upper center, pale orange to orange-buff on some young specimens with a pale center and stipe pith, often brighter orange on stipe base. There are probably five species in the deliciosus complex in CA (based on our field work), hopefully we will have names for them soon.

thanks Noah.
By: Debbie Viess (amanitarita)
2011-12-26 20:21:04 CET (+0100)

I do see olive tones at the edge of the cap, but the bright orange context in the stipe base stayed orange, and darned if that cap and cap context don’t look more blue than green. Both the PNW version and the Smith version talk about the layered colors in the cap context: olive and yellow and orange, somewhat occluded by that overall bluish color shown here.

Anything different in the Methven version?

Not easy to do this just from a photo, from your end or mine…guess that I’ll have to pray for a wet year in the PNW come next fall, so I can determine these features, plus or minus, in hand. IF I stumble across more material.

Do you have good field photos of this variety? By all means, put ’em up here on MO, so we can all see these features. They do seem a bit ambiguous for this sighting.

Hesler & Smith
By: Noah Siegel (Noah)
2011-12-26 19:50:47 CET (+0100)
By: Debbie Viess (amanitarita)
2011-12-26 19:42:19 CET (+0100)

Okaaaaayyy, not saying the latex was green at this point (although I did assume that at first hand), just that the flesh was damply green as soon as it was cut, not orange then green.

Don’t have either of those books or descriptions…could you please do a pull-quote?

From the photo itself, the host tree was not apparent, which is all that we have to go by at this point. “That Area” had lots of tree species.

There seems to be some dispute about the actual variety olivaceosordidus from the DNA evidence, at least in that paper that I linked to. Not arguing the obvious, that we don’t have any deliciosus here in NA.

Not a very common species variety to most of us here in CA, and probably not to you either, before this year. Just seeking clarification.


By: Noah Siegel (Noah)
2011-12-26 19:17:54 CET (+0100)

The Agaricales of California 10 by Methven
Lactarius of NA, by Hesler & Smith.

This mushroom does NOT have green latex, it has orange latex, look at the damaged stipe base… It has turquoise cap flesh, and no visible latex from the gills or cap on your cut.

I don’t see spruce needled in the picture (that I can tell for sure) but there are a lot of spruce in that area.

Var. olivaceosordidus is a west coast name, (Pacific City, OR) for a distinct taxa. Yes we all know it’s not L. deliciosus but Lactarius deliciosus var. olivaceosordidus is still the best (and only) name for the small greenish Sitka Spruce “Delicious Milk Cap”

got a “best description” in print somewhere?
By: Debbie Viess (amanitarita)
2011-12-26 17:07:56 CET (+0100)

No mention of how quickly the latex greens in any description that I could find. This one was green and unchanging when cut.

Sitka Spruce has pointed needles; these are blunt. Size differences overlap between varieties, so that’s no slam-dunk either.

One clear diff is the colors of the inner cap. From Roger’s mushrooms: “Cap flesh thin, orange near the gills, olive in the cuticle, and yellowy in the middle.”

Still, I agree that this is closest to what is getting called olivaceosordidus, but there is still some dispute about the American as well as the Asian deliciosus varieties, at least in this paper from 2007:


By: Noah Siegel (Noah)
2011-12-26 05:01:11 CET (+0100)

and I doubt the latex color was dark green, more likely it was the flesh color you were seeing, this mushroom hardly has any latex.

By: Noah Siegel (Noah)
2011-12-26 04:59:05 CET (+0100)

Small size, dingy colors, scant orange unchanging latex, quick to stain green. Growing with Sitka Spruce.

could be…
By: Debbie Viess (amanitarita)
2011-12-26 03:53:28 CET (+0100)

it wasn’t like any deliciosus that I had ever seen before…

what are the defining macro characters for olivaceosordidus that would eliminate all other varieties?

Created: 2009-10-18 17:51:00 CEST (+0200)
Last modified: 2013-12-02 06:01:07 CET (+0100)
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