Observation 7204: Contumyces rosellus (M.M. Moser) Redhead, Moncalvo, Vilgalys & Lutzoni
When: 2008-03-29
Herbarium specimen reported

Notes: On close examination, cap appeared roughened, not glabrous, and speckled with vinaceous spots. Gills widely spaced and marginate. Fresh specimens
rapidly developed a vinaceous stain at their bases when plucked cruelly from their mossy beds. They were growing alongside hornworts, my very first encounter with this common but easily overlooked primitive plant, on a rocky, moss-coverd slope, with an Eastern exposure.

Omphalina pyxidata, or something more unusual? Any suggestions for going deeper on this ID? My scope stands at the ready…

Proposed Names

-77% (2)
Recognized by sight
9% (3)
Recognized by sight
-13% (2)
Used references: Bigelow, H. E. 1985. North American Species of Clitocybe Part 2. J. Cramer Co. New York, NY. 471p.
84% (3)
Eye3 Eyes3
Recognized by sight: Compare to observation 185. Note the ‘marginate’ gills and the furry cap in the photo. Note that this used to be Omphalina rosella before the DNA was examined.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Contumyces rosella var. rosella (not. vinacea!!)
By: Dimitar Bojantchev (dimitar)
2008-04-09 23:14:39 CDT (-0400)

Debbie brought the specimen over to my house this morning. We looked
at it together. The spores and marginal cells looked within range for
C. rosella (sensu Antonin & Noordeloos). There was no
caulocystidia(!!) — I prepared two slides looking for it, none, or
just some loose hyphal ends here and there. Because var. vinacea
(Redhead et al) is described with abundant caulocystidia, therefore
this is no it. The spore size for this collection is: (7.5)8-9.5 x

Here isn image of the spores for this collection:

And marginal cells on the gill edge — not quite convincing, but within general range…

Contumyces rosellus
By: Debbie Viess (amanitarita)
2008-03-31 10:27:55 CDT (-0400)

Thanks for going deeper Nathan, it’s a good fit! Any species descriptions to be had?
Here’s a link to another fine photo of it:
It dried nicely, and is bound for the Thiers herbarium.

Misplaced Preserve?
By: Ron Pastorino (Ronpast)
2008-03-30 22:33:54 CDT (-0400)

Alameda County and Oakland are not amused.

O. pyxidata? what about cap texture, marginate gills?
By: Debbie Viess (amanitarita)
2008-03-30 21:39:45 CDT (-0400)

can this mushroom have both marginate gills and a cap surface with appressed fibrils? otherwise, it seems like a fit.

Created: 2008-03-30 12:30:24 CDT (-0400)
Last modified: 2008-03-31 20:46:55 CDT (-0400)
Viewed: 368 times, last viewed: 2016-10-23 23:21:45 CDT (-0400)