Observation 68291: Cortinarius subgenus Dermocybe stirps Rubelli
When: 2011-05-28
Herbarium specimen reported

Notes: Pileus- 20-55mm, convex with a low broad umbo, brilliant red-orange fading to ochraceous orange, paler yellowish-orange towards the margin with a red-orange margin, fibrillose, dry.

Stipe- 10-15×70-80mm, fusoid with a tapered and often rooting base, yellow with brilliant red-orange fibrills and velar remnants or girdles, context yellow with some red pigmented areas.

Lamellae- Adnexed to almost free, close to crowded, yellow-brown to orange.

Alkaline reactions- 3%KOH Very dark wine red, almost black on pileus and stipital veil but fading to blood red in the latter, blood red in stipe context and lamellae.

Spores- Subglobose, moderately verrucose.
Range- (6-)6.5-7×5-5.5µm.
Average- 6.5×5µm.

Cystidia- Absent.

Contents of basidia staining blood red in 3%KOH

The link below shows a collection from the same location last year.
http://mushroomobserver.org/47385?q=4dCn

I’m not convinced that this is C. veronicae due to the yellow stipe which is fusoid and often rooting and due to the alkaline reaction on the pileus which is almost black, this is fruiting in association with Kunzea ericoides, there is no Nothofagus in this area.

I think this is much closer to the very rare C. papaver and could be that species or an undescribed and closely related species that associates with Myrtaceae forest.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
Probably n sp
By: Karl Soop (karlsoop)
2011-05-30 03:06:36 CDT (-0400)

Hi Mike and everyone,
I think this is a new species, bound to myrtaceous hosts. Cortinarius is much more host-specific than earlier thought, and both C. papaver and C. promethenus appear to be Nothofagus-bound, as probably also C. veronicæ. I didn’t see the yellow tinge on the stipe on the previous picture, which would rule out C. veronicæ. Also your fungus doesn’t look hygrophanous. It resembles C. papaver, but there are subtle differences in the cutis structure that one can at least guess at from the picture.

A pity we didn’t find it when we were foraying there a couple of weeks ago. I suggest you keep the material and submit some of it to PDD. It is most likely a new Dermocybe ss. lato (sect. Austronanceiensis). It may be strongly toxic.

Proposed name,
By: Michael W (Michael Wallace)
2011-05-29 20:08:58 CDT (-0400)

I propose the name Cortinarius cf. papaver in this comment because it won’t let me do so at the “Propose another name” function for some reason, I think this collection should carefully be compared with that rare species.

Created: 2011-05-29 19:59:54 CDT (-0400)
Last modified: 2011-07-11 23:43:02 CDT (-0400)
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