Observation 33314: Amanita Pers.

When: 2010-02-08

Collection location: Santa Cruz, California, USA [Click for map]

Who: Ryane Snow (snowmam)

No specimen available


Proposed Names

-16% (3)
Recognized by sight: found under oak; striate margin; very thick volva
-51% (3)
Recognized by sight: white spring form. patch of veil on cap, striate margin, totally elongating stipe (despite that fat volval sac!) Check spores for amyloidity to be sure.
30% (2)
Used references: personal notes and images…
33% (2)
Recognized by sight: Section unknown, barring further research. I think that this is the only ID name, with the limited info that we have, that we can all agree on.
30% (2)
Recognized by sight: white form, commonly seen. exannulate, white cap with striate margin, saccate volva that tapers slightly, totally elongating stipe.

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

= Observer’s choice
= Current consensus


Add Comment
Put velosa as a possibility…
By: R. E. Tulloss (ret)
2010-02-09 11:40:35 PST (-0800)

I can’t remember where I saw it (maybe in an email), but Debbie suggested a white specimen of A. velosa as a possibility. I can see her reasoning in the most recent post (below). Why don’t you nominate velosa as a candidate, Debbie?


it is tempting to just stick this one in Rod’s similar fallax…
By: Debbie Viess (amanitarita)
2010-02-09 11:25:19 PST (-0800)

but I am troubled by a number of differences, taken from Rod’s species description of Amanita fallax nom prov. here:


according to Rod’s description, Amanita fallax does not have a striate margin to the cap, and when it does show subtle striations in age, it also shows other age-related color changes that are not shown here. there is no pink or brown staining on the gills cap or stem of Ryane’s specimen. the stem base does not appear to be rounded despite that thick volval sac, and the sac itself looks somewhat tapered. the upper stipe appears utterly smooth, also in contrdiction to the species description.

without more information and a specimen in hand I am not even comfortable sticking this one into a section, since it shares gross similarities with a number of them.

gosh Ryane, it’d be great if you could find (and collect) more!!!

good to know that a potential CA amidella exists…
By: Debbie Viess (amanitarita)
2010-02-08 15:54:10 PST (-0800)

hard to find those unpublished amanitas!

that’s the benefit of having you on this site, Rod.

that UV patch on the cap does look oddly friable…
this is certainly the year of weird white amanitas.

need a specimen in hand to truly confirm, tho…could also be a white velosa, which does get elongated like that, and is also exannulate.

can you find this again Ryane?
By: Debbie Viess (amanitarita)
2010-02-08 15:46:53 PST (-0800)

a little Meltzers would sure help us get to a section…

I looked up my notes and…
By: R. E. Tulloss (ret)
2010-02-08 13:09:05 PST (-0800)

I think there is a good chance that this collection represents Amanita fallax (nom. prov.). There will be a description and an illustration on the new Amanita Studies site (I just posted them). Hopefully, I will be able to post as complete a technical description as exists by the time the site is open for business. Meanwhile, I’ll post an image of A. fallax from Mexico, here.


There is an amidella known from California…
By: R. E. Tulloss (ret)
2010-02-08 12:12:36 PST (-0800)

Amanita fallax Tulloss & G. Wright nom. prov.; however, I’m not convinced that that is what Ryane has. It’s been quite some time since I looked at my lonely picture of A. fallax; however, I think the form of the fruiting body is about right…maybe with the exception of the volva on the cap. I need to read by notes again on this species. In southern California of 20-plus years ago it was mistakenly called “A. volvata.”

Let me see what I can find. Haven’t thought about it for a long time.


checking the spores is the key to section…
By: Debbie Viess (amanitarita)
2010-02-08 11:24:30 PST (-0800)

vaginate or caesarea amanitas are hyaline; amidellas (which to my knowledge don’t occur here in CA) and lepidellas are amyloid.

no evidence of a partial veil
By: Ryane Snow (snowmam)
2010-02-08 10:54:07 PST (-0800)

No skirt was evident on this specimen. Perhaps it is an amidella.

indeed this one does not fit neatly…
By: Debbie Viess (amanitarita)
2010-02-08 09:15:27 PST (-0800)

it would be great if you could bring these weird things home Ryane, so we could all go a bit deeper!

Enlarging your photo, even the striations are not as clear as I’d like to see for a coccora… and I don’t see an annulus but of course that is a friable feature. heck, even the UV on the cap looks a bit friable! But that volva…so not a lepidella! wouldn’t you agree?

aaaaggghh, it’s the curse of the white amanitas!!!

But proportions are odd for calyptroderma, aren’t they?
By: R. E. Tulloss (ret)
2010-02-08 08:02:01 PST (-0800)

And is there any evidence that there was once a skirt on the stem?


Created: 2010-02-08 06:32:52 PST (-0800)
Last modified: 2010-07-30 07:05:53 PDT (-0700)
Viewed: 354 times, last viewed: 2019-03-04 18:33:45 PST (-0800)
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