Observation 56511: Cortinarius purpurascens group

When: 2010-10-18

Collection location: Diamond and Crater Lake, Oregon, USA [Click for map]

Who: Ron Pastorino (Ronpast)

Specimen available

Caps up to 8cm across.
Spores ~ 8.0-9.0 X 4.9-6.1 microns.
KOH reactions were weakly brownish to neg. on all surfaces.



Proposed Names

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Section Purpurascentes
By: Dimitar Bojantchev (dimitar)
2010-10-25 14:13:09 PDT (-0700)

The right name for this observation should be: Cortinarius, Subgenus Phlegmacium, Section Purpurascentes. This is a very real and phylogenetically well supported section. There should be a “Free Text” field associated with these obs where one can enter such info, which also becomes searcheable. I’d like to find all observations that have “purpur*” in them.

More numbers
By: Dimitar Bojantchev (dimitar)
2010-10-25 14:08:36 PDT (-0700)

My Swedish “porphyropus” has spore size 8.5-10 × 5.2-6. My general Western American purpurascens collecitons are 8-9 × 4.5-5.5. For what its worth this is fairly compatible with the literature. What’s the species above — we’ll see… This is not the first time we stumble on that purpurascens vs. porphyropus question. My prior collections would agree with purpurascens, but something about it reminds me more of porphyropus…

By: Irene Andersson (irenea)
2010-10-25 14:04:42 PDT (-0700)

I did mean neutral with KOH/NaOH..

Dear Irene, on the iodine part…
By: Dimitar Bojantchev (dimitar)
2010-10-25 13:32:55 PDT (-0700)

Irene, not sure Ron meant that he tested with iodine, but nevertheless, I have to remind us that C. purpurascens was the one that does have a strong and definite reaction to iodine. And so does C. porphyropus. This has been described in the literature, as well as supported by my experiments with highly molecularly compatible purpurascens collections to the European material.


As far as the size of the spores – there appear to be 2 different species in North America that go by that name C. purpurascens. The first one has smaller spores than those shown by Ron here, narrower. The other one is mentioned in Kauffman, which has larger spores and I was fortunate to collect in Montana recently. These spores, as shown here, kinda remind me more of the Swedish material I obtained. If I could load pictures I would.

The coloration is less of a factor, it seems, as my collections from California varied between blue and brown caps – with these Corts too, the bluish tinges are very unstable and do not age well.

Now, the best part – I will have them sequenced soon too and then we’ll have a cleaner picture of what is what. Ron, make sure you pass me that material, if you have it – it is very good stuff.

By: Irene Andersson (irenea)
2010-10-25 01:15:30 PDT (-0700)

it has all the characters that usually lead me to C. purpurascens:
The spore shape and size, neutral reactions to iodine, the small and blunt bulb, connection with conifers. The cap colour can vary from greyish brown to deep purple.

The bruising reaction… This actually is a very nice collection.
By: Dimitar Bojantchev (dimitar)
2010-10-24 22:15:26 PDT (-0700)

This actually is a very nice collection. The key feature of this Phlegmacium is the reaction upon bruising. To me it looks more like C. porphyropus. Let Irene chime in too as she knows these well. If you send me this material, I will get it together with my Swedish collections of C. porphyropus and we’ll see how close they are. Is there a way that I can just upload a photo in the comments section without having to put it on a Website first?


Created: 2010-10-24 21:19:16 PDT (-0700)
Last modified: 2016-03-13 19:16:11 PDT (-0700)
Viewed: 146 times, last viewed: 2018-11-07 04:20:14 PST (-0800)
Show Log