Cap: 2.5-6.5 cm wide.

Gills: Edges brownish on large specimen.

Stipe: 6-8 × 1-2.5 cm. Volva staining yellowish brown, leaving crumbly annulus-like remnants on stipe of two of the smaller specimens.

Habitat: Scattered in grassy area near Picea engelmannii and Pseudotsuga menziesii.

Spores: 12-15 × 7.5-11 um (may be inaccurate as I havn’t seen any Vaginatae descriptions with spores that large), finely bumpy?, or with granular contents, globose to eliptical to pear-shaped.


1 um divisions
1 um divisions

Proposed Names

82% (1)
Used references:
Based on microscopic features: spore measurements
Based on chemical features: genetic match for nrITS (100%) and nrLSU (100%)

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= Observer’s choice
= Current consensus


Add Comment
The measurements avalable for this material extend the data available for the…
By: R. E. Tulloss (ret)
2018-12-09 07:40:55 PST (-0800)

…macroanatomy of this species.


Very best,

Rod Tulloss

DNA sequences derived for nrITS and nrLSU.
By: R. E. Tulloss (ret)
2018-12-08 19:20:42 PST (-0800)

Apparently this is a very good match for Amanitasp-WA03” previously known from the state of Washington. It’s late at night. Give me a chance to review this in the morning. In the meantime check the spores reported by Edward Barge against the spore size and shape reported here:

It seems the reports both indicate rather larger broadly ellipsoid spores.

Very best,


Sampled for DNA sequencing today.
By: R. E. Tulloss (ret)
2018-05-18 12:18:56 PDT (-0700)

Thank you, Ed, for this very interesting material. I appreciate your sending it.

Very best,


Your material has arrived.
By: R. E. Tulloss (ret)
2012-07-24 13:19:24 PDT (-0700)

Thank you for the great packing job. All arrived safely.


By: R. E. Tulloss (ret)
2012-07-12 14:37:32 PDT (-0700)

We will watch for its appearance at the post office.


Package sent
By: Edward Barge (landsnorkler)
2012-07-12 13:28:08 PDT (-0700)

Collection number is EB0095.

I forgot to mention…
By: R. E. Tulloss (ret)
2012-07-12 05:57:55 PDT (-0700)

For more information about crassospores, you can search for the word on the WAO site:


Thanks Rod
By: Edward Barge (landsnorkler)
2012-07-11 16:41:24 PDT (-0700)

Interesting stuff. I’ll get them in the mail soon.

Cool material.
By: R. E. Tulloss (ret)
2012-07-10 14:23:30 PDT (-0700)

Granular contents is much more likely than a bumpy surface, but search for “crassospores” in MO comments of the past. We’ve had at least one posting that involved a specimen with the “crassospore syndrome.”

There are species in section Vaginatae with spores as big as you describe; and young material can sometimes be in a temporary state of making spores from two-spored basidia before the four-spores per basidium process stabilizes. You might be seeing “giant” spores from a specimen that was near the beginning of sporulation when you collected and dried it.

I would be very interested in seeing your dried material if you are willing to send it.

My address can be found here:

Thank you in advance.

Very best,