Observation 111824: Cortinarius stillatitius Fr.
When: 2012-09-22
No herbarium specimen

Notes: at hi elevation in spruce fir forest.

Proposed Names

48% (2)
Eye3 Eyes3
Recognized by sight: slimy brown cap w/out striations, slimy purple stipe. similar to our western Cort vanduzerensis which has a striate cap margin.
Based on microscopic features: limoniforme, finely verrucose, thick walled, large, 15 × 9.5.
43% (2)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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you will get no argument from me on that last point! ;)
By: Debbie Viess (amanitarita)
2012-10-03 11:13:15 EDT (-0400)
Still within the range
By: Irene Andersson (irenea)
2012-10-03 04:16:09 EDT (-0400)

of elatior, but you could be right.
It doesn’t match the stillatitius I know, which is very common here, but an american form could certainly be a bit different – by all means, even the british one here:
http://www.britmycolsoc.org.uk/download_file/view/109/

I doubt that all of these species are sufficiently investigated yet..

uh oh.
By: Debbie Viess (amanitarita)
2012-10-02 20:51:49 EDT (-0400)

just found my spore data for this obsie (I am still unpacking from my trip). I think that puts us back to C. stillatitius.

spores limoniforme, finely verrucose, thick walled, large, 15 × 9.5.

Do spores trump macro, which can after all show variability?

thank you Irene.
By: Debbie Viess (amanitarita)
2012-10-02 11:02:04 EDT (-0400)

experience is a great teacher! I can now clearly see these differences.

Comparison
By: Irene Andersson (irenea)
2012-10-02 03:29:47 EDT (-0400)

cap, elatior: conical, wrinkled when old;….. stillatitius:convex

stem top, elatior: striate and tapering upwards from the cortina zone;….. stillatitius: not striate, straight upwards

spores, elatior: smaller, with irregular, larger warts;….. stillatitius: larger, densely verrucose

fruiting, elatior: autumn to late autumn;….. stillatitius: summer to early autumn

I can see the resemblence with elatior…
By: Debbie Viess (amanitarita)
2012-10-01 16:20:10 EDT (-0400)

and it is hard to see the actual cap texture under the slime, but in hand, it was decidedly not striate nor noticeably wrinkled.

what other differences are there?

Created: 2012-10-01 13:28:36 EDT (-0400)
Last modified: 2012-10-03 04:20:21 EDT (-0400)
Viewed: 110 times, last viewed: 2016-02-03 08:21:15 EST (-0500)
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