Observation 79537: Cortinarius semisanguineus (Fr.) Gill.

When: 2011-10-09

Collection location: Indian Gap Parking Area, Blue Ridge Parkway, Virginia, USA [Click for map]

Who: Matt Sherman (Shermanii)

No specimen available

Growing on a small bank near predominantly hardwood, but mixed forest.



Proposed Names

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Just happened to find…
By: Dave W (Dave W)
2011-10-24 20:29:52 EDT (-0400)

yesterday, in a pine area (Pitch Pine, I think).


By: Irene Andersson (irenea)
2011-10-22 13:16:49 EDT (-0400)

I think every species is more or less a species complex.. C. semisanguineus seems to be a very wide-spread cort, and I assume that its DNA has been slightly changing during the time it has spread along the continents, maybe even several times back and forth. Some changes have made it able to adapt to new hosts, others have lead to a change of pigments. Since the diversity seems larger in North America, I guess that its origin was there.

This particular collection also has a slightly different cap colour than “our” semisanguineus, more orange than our typical olive yellow ones. But I have also seen american collections here on MO that look perfecly like the ones I know. And I have seen thousands here in Sweden, it’s one of the most frequent species in our pine woods.

I haven’t tried to find and compare any DNA sequences or microscopic descriptions. It feels useless to do that if you haven’t seen the particular collections, or have any information about their habitat.

Species complex?
By: Matt Sherman (Shermanii)
2011-10-22 10:28:38 EDT (-0400)

Dave, nor have I, but I’m hoping to make a collection or two to study this fall or next year.
I’ll keep those two habitats that you mentioned in mind while hunting, thanks.

Irene, do you know if the European C. semisanguineus material differs from the North American material at all? Dave mentioned something about a species complex. I’ve heard people on M.O. mention the C. semisanguineus “complex” before, but I do not know much about this. The reason I ask about the material differing, is you said you only find C. semisanguineus under only pine and Dave mentioned two different habitats that he finds it in.
I was just wondering why the same species would be found under a specific genus of tree in Sweden (I assume that is your location.) and under a variety of genera of trees in North America.

Habitat is interesting too
By: Irene Andersson (irenea)
2011-10-21 07:58:41 EDT (-0400)

I beleive that this could be a colour form of semisanguineus, but I find that species with pine only. It is said to grow occasionaly, but rarely, with other trees (Picea, Betula and Fagus).

No, I haven’t looked
By: Dave W (Dave W)
2011-10-21 07:48:12 EDT (-0400)

at any micro traits. But it looks like this species (or complex) may be more interesting than I had supposed. So next year I hope to study them a bit more closely.

I find this type in at least two distinctly different habitat… acidic hilltop oak woods, and mixed woods (birch, maple, cherry, hemlock) where there is no oak at all.

By: Matt Sherman (Shermanii)
2011-10-20 21:39:47 EDT (-0400)

Those pink stipe bases are interesting.
I don’t find this species too often, but I’ll keep an eye out.
Have you looked at any of your C. semisanguineus collections under a scope?

Here’s a collection I made last year;
By: Dave W (Dave W)
2011-10-20 09:59:18 EDT (-0400)

same location as in the previous link. This collection shows pink stipe bases. Also, the gills are pinkish in this obs.


Kuo mentions that there are several C. semisanguineus variants, based upon gill color. Looking at my old observations, it looks like gill color for my collections tends to be on the pink side, although usually a deeper more vivid shade. Some collections show no pink on the stipes.

Both of those…
By: Matt Sherman (Shermanii)
2011-10-19 10:32:14 EDT (-0400)

Both of the linked observations look very similar to mine. Thanks for the comparisons!

I remember
By: Irene Andersson (irenea)
2011-10-19 06:53:47 EDT (-0400)

another one too, from Alaska:
I wonder what became of it..?

Here’s the obs
By: Dave W (Dave W)
2011-10-19 03:03:58 EDT (-0400)

of my recent C. semisanguineus collection. Looks just like the one seen here.


By: Matt Sherman (Shermanii)
2011-10-18 19:43:09 EDT (-0400)

Yes, the photo does tell the true gill color.

Thanks for the input guys.

This fall I have run across
By: Dave W (Dave W)
2011-10-18 10:34:10 EDT (-0400)

a few fruitings of C. semisanguineus which showed lighter than usual gill color. These occurrences were in spots where I had found semisanguineus in previous years (Pennsylvania). So, even though my vote is only made at the “promising” level, I think this is C. semisanguineus.

I think
By: Irene Andersson (irenea)
2011-10-18 03:03:40 EDT (-0400)

it’s better kept as semisanguineus instead of the deep darkness Cortinarius sp… Does the photo tell the true gill colour?

Cortinarius sp.
By: Matt Sherman (Shermanii)
2011-10-17 23:55:52 EDT (-0400)

Should we bring it back to Cortinarius sp.?

By: Irene Andersson (irenea)
2011-10-17 12:55:14 EDT (-0400)

A pink-gilled semisanguineus – that’s strange.

Created: 2011-10-14 10:50:55 EDT (-0400)
Last modified: 2011-10-19 10:32:45 EDT (-0400)
Viewed: 184 times, last viewed: 2018-08-25 18:27:39 EDT (-0400)
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