Observation 16203: Tricholoma nigrum Shanks & Ovrebo
When: 2009-01-06
No herbarium specimen

Notes: These were growing under manzanita. While Tricholoma portentosum was an option the violet tints on the cap and the slight cucumber odor seemed to indicate T. griseoviolaceum.
Edit 3-1-2013; Found spore print. Spores ~ 6.9-8.0 X 5.0-6.1 microns, Q(ave.) = 1.30.
Spores size is a better match for T. nigrum, which are larger than T. griseoviolaceum.

Proposed Names

48% (2)
Eye3
Used references: Shanks “The Agaricales of California”
59% (2)
Eyes3
Recognized by sight: Dark gray disc, not very virgate, small black scales on stipe. Odor is suppose to be strongly farinaceous. Also compare with T. mutabile

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Further confirmation for T. nigrum
By: Ron Pastorino (Ronpast)
2013-03-01 16:22:45 PST (-0800)

are the spores, which I had saved. They were ~ 6.9-8.0 X 5.0-6.1 microns.
These are a better match for T. nigrum than T. griseoviolaceum, whose spores are smaller.

Nigrum spores
By: Noah Siegel (Noah)
2013-03-01 16:15:03 PST (-0800)

Are listed as 6.7-8.6 × 4.8-5.8 microns, elliptic, smooth, inamyloid,

Thanks Noah,
By: Ron Pastorino (Ronpast)
2013-03-01 08:33:44 PST (-0800)

Coincidentally I was looking at that observation a few days ago and thought that it wasn’t quite right. T. nigrum does look like a better possibility.

Created: 2009-01-09 21:05:01 PST (-0800)
Last modified: 2014-01-02 03:33:25 PST (-0800)
Viewed: 154 times, last viewed: 2016-10-30 18:36:52 PDT (-0700)
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