Observation 173429: Cortinarius aureifolius Peck

stumped all who ventured a guess or gander.

Pileus: 18-36mm in diam.; convex to plano-convex to depressed at maturity; yellowish tan to dark buff brown; surface darkening (reddish) in KOH; appearing minutely granular under the hand lens but soft and smooth to the touch; margin decurved to inrolled, irregularly/unevenly crenulate; context a semi-transparent grey with a yellow-brown tinge; up to 4mm thick at center to >1mm at margin; odor and taste mild.

Lamellae: broadly attached with a minute, decurrent tooth; subdistantly spaced; concolorous with pileus surface, though lighter along edges; spores medium to light brown in deposit.

Stipe: central to eccentric; 2.5mm-4mm thick x 25mm-40mm long; equal with a slightly swollen base, occasionally with some basal tomentum; surface dry, smooth, adorned with sparse, brown fibrils against a buff brown background; texture fibrous, not breaking cleanly; context solid to somewhat hollow in age; mottled cream to beige.

Substrate: suspected to have been growing in sandy soil judging by material adhering to stipe base and consult with collector

Habitat: mixed deciduous + coniferous temperate rainforest, ~4500 ft.

Collectors: Ahmed Mustafa

Collected for the 2014 Fleshy Fungi of the Highlands Plateau course, taught by Andy Methven at the Highlands Biological Station in Highlands, North Carolina.



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Eye3 = Observer’s choice
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your comments
By: Danny Newman (myxomop)
2014-08-13 20:30:17 CDT (-0400)

have changed it to promising :)

after all, one of us knows a great deal more about this taxon than the other.

thanks to all for the comments and contributions.

About those discrepancies
By: Joshua Birkebak (Shua)
2014-08-13 19:27:38 CDT (-0400)

l am not convinced that they are not characters that may be environmentally plastic. Coloration can be variable (though the chemical test does seem a little odd) as can margin based on weather and habitat. I may be making this up but I tend to find that “normal” fungi can look very abnormal when growing in sandy stream beds (which I am guessing this is from?). I don’t put too much stock in Lamellulae from my personal experiences with some groups atleast though I don’t know how consistent it may be in Cortinarius. Additionally the Stridvalls’ pictures are of european material and, in an uncommon twist of fate, the Europeans and using an American name for their stuff which may not be conspecific. It is nice to see them having to deal with our problems every once in a while :P

All in all though a “could be” rating is not unwarranted.

Well, it appears there aren’t many
By: Ron Pastorino (Ronpast)
2014-08-13 16:02:58 CDT (-0400)

described Cortinarius with Boletoid spores.
Two are noted in this article…

Jacobsson S. & Soop K.: A Review of Cortinarii with Boletoid Spores —

Journal des J.E.C. 2, 2000 — ISSN 1560-7658.
Taxa with lean, narrowly fusoid spores in the genus Cortinarius are reviewed
and the discussion focusses on the interpretation of two names: C. heterosporus
Bres. and C. aureifolius Peck. Type material and own collections have been
investigated, including SEM studies and DNA sequencing. The name
C. heterosporus is lectotypified.

Stig Jacobsson, Dept. of Systematic Botany, University of Gothenburg, Sweden
Karl Soop, Elinshillsv. 9, S-132 48 Saltsjö-Boo, Sweden.

By: Danny Newman (myxomop)
2014-08-13 13:19:54 CDT (-0400)

from the Mycotaxon article:

C. aureifolius

1. margin even
2. cap turning violaceous fuscous then quickly mahogany red after application of KOH
3. typically with greyish brown to fuscous tints over the disc
4. lamellulae in 3-4 series

Observation 173429

1. margin distinctly crenulate
2. cap turning dark red directly without preceeding color
3. lacking greyish brown to fuscous tints
4. lamellulae in 2 series

these aside, there are many, many qualities in common. still, I am having a hard time reconciling the fungus pictured here and those in the following photographs:


…assuming those are pictures of C. aureifolius

i took a late night look
By: Danny Newman (myxomop)
2014-08-13 02:00:37 CDT (-0400)

at some web pictures of C. aureifolius, and I’m having doubts. online images show cortinas, thicker, whiter stipes, and obviously fibrillose pilei…

will scope this again and look for corroborating (or contradicting) characters.

By: Richard Kneal (bloodworm)
2014-08-13 01:08:43 CDT (-0400)

index fungorum needs to be updated, as well.

By: Joshua Birkebak (Shua)
2014-08-13 01:07:53 CDT (-0400)
By: Richard Kneal (bloodworm)
2014-08-13 01:05:24 CDT (-0400)

smart taxonomists ruining everything… ;)

also…no worries.

Yeah sorry Richard,
By: Joshua Birkebak (Shua)
2014-08-13 01:03:43 CDT (-0400)

For not giving you the credit of having the right organism, just the wrong name. Stupid taxonomists ruining everything…

By: Richard Kneal (bloodworm)
2014-08-13 01:01:58 CDT (-0400)

thanks Joshua.
very interesting.

thank you as well, Danny.

10 points to Birkebak!
By: Danny Newman (myxomop)
2014-08-13 00:59:06 CDT (-0400)

i shall tell of your epiphany tomorrow morning and label the collection accordingly.

sidenote credit to Richard for getting awfully close with I. angustispora

i feel compelled to mention that fibrillosity was in short supply on these. the pileus surface was decidedly smooth in feel, though certainly “ornamented” with some kind of fuzz upon very close inspection. should the cap fibrils be more macroscopically evident in C. aureifolius?

A truly spectacular Cortinarius
By: Joshua Birkebak (Shua)
2014-08-13 00:54:44 CDT (-0400)

Sent me for the biggest loop the first time I saw it. Then I learned that my prof had written a paper about it

Created: 2014-08-12 10:07:30 CDT (-0400)
Last modified: 2014-08-13 20:30:48 CDT (-0400)
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