Observation 52227: Cortinarius arcuatorum Rob. Henry

When: 2010-09-05

Collection location: Thoiry, France [Click for map]

Who: Douglas Smith (douglas)

No specimen available

Found oak, hornbeam, and fir.

Cap viscid, stipe not viscid, with bulbose base. Gills lilac-grey, white rhizomes at base. All tissues stain bright rose-pink in KOH.

The micro-shot is of spores from the veil at 1000x in KOH. The spores are ellipsoid, brown, warted, with a smooth point and no germ pore. Apr. size 10 × 6 um.

Putting this together with Funga Nordica, this one drops out rather quickly as Cortinarius arcuatorum. The all tissues turning bright rose pink like this makes the id actually fairly easy.

Proposed Names

86% (1)
Eye3 Eyes3
Recognized by sight
Used references: Funga Nordica, web sites.
Based on microscopic features: As described in the text.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Ok, well…
By: Douglas Smith (douglas)
2010-09-08 03:04:50 PDT (-0700)

Then I guess I’m not really going to be a true Cortinarist any time soon it seems…

A true cortinarist
By: Irene Andersson (irenea)
2010-09-08 00:36:55 PDT (-0700)

hardly accepts a single, dried out specimen as a collection.
That’s why keys are so hard to follow.
You are expected to have them fresh and in several stages, from buttons to grown out caps in order to recognize the described colours (on caps, veil and flesh etc.). Like you said, the colours fade and can change considerably with age and on drying. So, I can’t argue for or against any particular name here.

Yes, but…
By: Douglas Smith (douglas)
2010-09-07 13:14:08 PDT (-0700)

Yes, but those are young fresh, damp guys, this one was an older, very dry guy. Not sure it is that far off, once it dries out? The rose-brown color…

If you
By: Irene Andersson (irenea)
2010-09-07 12:56:37 PDT (-0700)

take a look at obs 32161, you will see a difference in colours..

By: Douglas Smith (douglas)
2010-09-07 12:43:06 PDT (-0700)

Ok, maybve I need more sources, and ok, I think one problem with corts, is that no one seems to be able to write a reasonable key… without twists and turns, and surprise traps for the unwary.

But from the descriptions in Funga Nordica at least, it doesn’t seem to match with the description of C. dibaphus. Which says the cap and stipe should violaceous, and that the stipe has a relatively narrow, not sharply marginated bulb. The habitat and spores do seem to work for both really.

Or are you joking with me, and these are synonyms… boy the desc. there are really close in both…

By: Irene Andersson (irenea)
2010-09-07 12:14:55 PDT (-0700)

This reminds more of dibaphus if you ask me

Created: 2010-09-07 09:49:14 PDT (-0700)
Last modified: 2010-09-07 09:59:21 PDT (-0700)
Viewed: 109 times, last viewed: 2017-06-07 20:57:24 PDT (-0700)
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