Observation 11417: Cortinarius semisanguineus (Fr.) Gill.

When: 2008-09-16

Collection location: Eastern Long Island, New York, USA [Click for map]

Who: Douglas Smith (douglas)

No specimen available

Found under oaks, and some mixed hardwoods. Some type of Dermocybe with shocking red-purple gills. I found these in a number of places, usually small with somewhat inrolled margins. Usually found with moss, but not always, I’m not sure if that had any meaning, or it was just a moist area. These were the largest and most mature specimens I saw.

Adding a second photo of them in the button stages, to show the cortina, also the photo came out rather well.

Species Lists


Proposed Names

44% (2)
Recognized by sight
40% (5)
Recognized by sight: I found a few C. semisanguineus a couple weeks ago. Two distinguishing features are 1. gills are a striking scarlet color. 2. cap cuticle is brownish or yellowish with a radially streaked appearance. I posted a photo at mushroomhunting.org under the topic heading “Pa Summer Shrooms.”

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= Observer’s choice
= Current consensus


Add Comment
Two different places here…
By: Douglas Smith (douglas)
2008-09-27 14:30:36 -03 (-0300)

Actually there are two different places here, I think I have photos from 6 different places… The first photo I show there was under oaks, and although it was a forest mixed with pines and oaks, other places had more pines few oaks, this place was mostly oaks, and at this spot there were very few pines, and seemed to be none near by.

The second photo there was near a pine tree, but also equally near lots of oaks. I put up the first photo there because those were the largest and most mature I found, most of the other seen were like the second shot, mostly small and in button stages. A lot of the small ones also seemed to be in moss, not sure if that was important, or if the mossy spots were just more moist.

Association with “oak and assorted hardwoods” still an issue…
By: Debbie Viess (amanitarita)
2008-09-27 14:13:46 -03 (-0300)

Susan Hopkins, a NE coast dermocybe expert thinks so, too. She, like Dorothy BeeBee, is one of the mushroom dye mavens, and pays particular attention to these species. She has also worked closely with Tom Volk. Here are her comments:
“Hi Dorothy, Looks like Cortinarius semisanguineus to me, but I am puzzled by the oak connection. No conifers nearby at all?”

Doug is usually a keen observer, and would have noticed conifers.
Unless these specimens were saved and can undergo further testing, I would recommend calling them Cortinarius species, semisanguineus group.

It is in the right direction, but the species name needs more work…
By: Dimitar Bojantchev (dimitar)
2008-09-26 04:57:36 -03 (-0300)

This red-gilled Cort is definitely in the Sanguinei section, but there are a few other competing species in there. Species name can be accomplished after a couple of checks (1) KOH reaction should be lilac and (2) sosme microscopy. Otherwise it could very well be C. purpureus (=phoeniceus var. phoeniceus).

If you promise to do the tests, I will publish a checklist of required tests when handling Cortinarius fresh in the field. :-)

deciduous trees
By: Dan Molter (shroomydan)
2008-09-25 20:50:39 -03 (-0300)

Lincoff says habitat “several to many on moss and ground near coniferous and deciduous trees” (pg 619). Lincoff dose not list any look-a-likes.

I have found red gilled corts under oak, but there have always been other trees nearby. I don’t think I have every been in an all oak forest.

Sweet cortina shot BTW Douglas!

can’t be semisanguineus if it occurs with oak!
By: Debbie Viess (amanitarita)
2008-09-25 20:10:58 -03 (-0300)

I’ll run it by the Ds…Dorothy and Dimi.

Created: 2008-09-22 13:22:20 -03 (-0300)
Last modified: 2008-09-22 13:22:20 -03 (-0300)
Viewed: 606 times, last viewed: 2019-02-09 15:52:55 -02 (-0200)