Observation 83109: Amanita gemmata group

When: 2011-11-23

Collection location: Teague Hill Open Space Preserve, San Mateo Co., California, USA [Click for map]

Who: Tom (LanLord)

No specimen available

While the colour of these were similar to the A. phalloides I had been finding in great numbers, there were some big differences. The colour was more yellowish than greenish, there was more of a rimmed bulb at the base than a volva and the partial veil was not obvious on either of the two specimens found.



Proposed Names

55% (1)
Recognized by sight: gemmatoid – striate margin rules out A. citrina, also I just want to point out that (as far as I know) we don’t interpret any of our local (CA) entities as that species
83% (3)
Recognized by sight: work in progress insofar as a good name. yellow color, rimmed bulb puts it into the gemmata group.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
many taxa in the gemmatoid group lose their annulus…
By: R. E. Tulloss (ret)
2011-11-24 15:02:32 CST (-0600)

…in a very convincing fashion rather early in development. A few appear never to have had one from the get go. To be of taxonomic value, “absense of a partial veil” has to be narrowed down to “absent from the get go” or “easily lost” or some other more specific description.

Amanita gemmata var. exannulata (apparently, the name has never been validly published…what was published was A. junquillea var. exannulata, see MycoBank) was apparently generated based on a European gemmata that had lost its annulus. That’s the going story at least and seems plausible to me. The species that Breckon was dealing with in the San Francisco area (and called var. exannulata) apparently does not have an annulus ever and is probably in need of a name. I was introduced to it on a MSSF foray around 1980 (at Land’s End, I think) and saw it again shortly thereafter in a city park in San Francisco.


another mushroom was known by the name exannulata…
By: Debbie Viess (amanitarita)
2011-11-23 20:01:49 CST (-0600)

the Amanita gemmata exannulata as I understood it was the one with the membranous volva that reached up the stipe.

there are a few gemmata and even pantherina types that seem to lack an annulus (or perhaps just lose it readily?). this looks like one of those.

Var. exannulata?
By: Tom (LanLord)
2011-11-23 18:23:51 CST (-0600)

Since there was no sign at all of a partial veil, would this be of the variety exannulata as mentioned in Mushrooms Demystified?

Created: 2011-11-23 17:16:45 CST (-0600)
Last modified: 2011-11-24 00:35:20 CST (-0600)
Viewed: 77 times, last viewed: 2017-06-10 04:12:08 CDT (-0500)
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