Observation 160732: Amanita calyptratoides Peck

When: 2014-03-04

Collection location: Oak Grove, Ripon, California, USA [Click for map]

Who: Randy Longnecker (Randy L.)

No specimen available

Growing at edge of grass along trail in oak woodland.

Species Lists



Proposed Names

70% (6)
Eye3 Eyes3
Recognized by sight
46% (2)
Recognized by sight: Per Rod’s comment, it’s at least in this section.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
melts into the stipe…
By: Debbie Viess (amanitarita)
2014-03-05 13:01:43 CST (-0500)

or disappears entirely. also, the dull brownish tan cap color, often subtle to almost absent cap striations and that tallow candle aspect to the stipe all help to nail this ID.

anyone ever eaten it? I have only ever collected singletons or ones a bit past their prime…all of those from the BA, not S. CA, but I do hope to remedy that next week, when I am talking to LAMS!

A good field character is the way the partial veil orten seems to “melt” into the stem.
By: R. E. Tulloss (ret)
2014-03-05 12:54:43 CST (-0500)


calyptratoides commonly loses that partial veil…
By: Debbie Viess (amanitarita)
2014-03-05 12:29:33 CST (-0500)

and then it can be easily confused with a grisette.

your obsie here corresponds to my collections of this species as well.

they are apparently much more common in S. CA than in Central CA.

Thanks for all the info
By: Randy Longnecker (Randy L.)
2014-03-05 12:23:50 CST (-0500)

This is a new species to me, very cool.

No concerns that I know of., Nathan. EDITTED.
By: R. E. Tulloss (ret)
2014-03-05 12:01:08 CST (-0500)

Santiago Sanchez from Jean-Marc Moncalvo’s lab in Toronto extracted DNA from quite a few of my collections of calyptratoides from locations ranging from the SF Bay Area to the region of Los Angeles (roughly, where the type came from). Genetically it appears to be all the same. So we have no evidence indicating that there is a cryptic look-alike in California. Within a short period of time (this year I hope), the first set of data from Santiago’s work will be published and the genes will appear in GenBank.

Compared to a lot of North American taxa, the evidence backing up the concept of calyptratoides (by which we can recognize it in the field) seems good right now.

There is material in central Mexico that looks like calyptratoides and may be segregatable. I’m not sure if I have the last word on that. Those sequences also came from my herbarium material; so we have “captive” specimens that can be used for further study as may be necessary.

We are about to get a jump forward in the amount of genetic data available on the Caesareae.

Very best,


Are there concerns about applying Amanita calyptratoides?
By: Nathan Wilson (nathan)
2014-03-05 10:17:49 CST (-0500)

This looks like classic specimens of this species to me, so I’m curious what Darvin and Noah would call if not this.

Just for clarification…
By: R. E. Tulloss (ret)
2014-03-05 08:42:41 CST (-0500)

Randy, the ring on the stem (in the Northern Hemisphere and Western Hemisphere, is a marker indicating the specie can be assigned to sect. Caesareae. I think that Darvin has got the ID.

There are some quite similar pictures and other data here:


Very best,


Created: 2014-03-04 23:16:01 CST (-0500)
Last modified: 2014-03-13 21:09:09 CDT (-0400)
Viewed: 143 times, last viewed: 2018-05-14 15:29:23 CDT (-0400)
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