When: 2009-01-06

Collection location: Bolinas Ridge, Marin Co., California, USA [Click for map]

Who: Ron Pastorino (Ronpast)

No specimen available

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.


Spores @ 1000X.
Spores @ 1000X.

Proposed Names

48% (2)
Used references: Shanks “The Agaricales of California”
59% (2)
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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= Observer’s choice
= Current consensus


Add Comment
Further confirmation for T. nigrum
By: Ron Pastorino (Ronpast)
2013-03-01 17:22:45 MST (-0700)

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 17:15:03 MST (-0700)

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

Thanks Noah,
By: Ron Pastorino (Ronpast)
2013-03-01 09:33:44 MST (-0700)

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.