Observation 83241: Amanita pantherina group
When: 2011-11-25
No herbarium specimen

Notes: Impressive specimen was found with one other of same type in grass; nearby trees were live oak, ponderosa pine, and deciduous oak. Specimen had 20-cm diameter cap, 16-cm long stipe. Stipe (~4.5 cm diameter) tapered to ~2.5 cm at base and flared to ~6 cm below cap. Gills appear adnexed. Feathered volva suggestive of A. cokeri; warts on cap surface more prominent centrally and seem too small for A. magniverrucata. Spores ellipitical, smooth.

Proposed Names

-16% (2)
Recognized by sight: Volva and annulus, warts on cap surface
Used references: Arora, D (Mushrooms Demystified, 1986); Kuo, D (Mushroom Expert.com website, 2006)
28% (1)
Recognized by sight

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
More info needed
By: Dimitar Bojantchev (dimitar)
2011-11-27 02:45:07 CST (-0500)

Andrew, I am pretty sure that I know this species from the Sierra Nevada foothills, but I need more info – a single fruitbody is a terrible choice to concentrate an entire taxonomic discussion on – my key question is about the friability/persistence of the annulus. Please post more photos, also consider the Nevada City foray on Dec. 10-th where I will examine every single Amanita (as well as Cortinarius and Russula) on the table and select material for dna studies.

This is absolutely not Amanita aprica.


This is interesting.
By: R. E. Tulloss (ret)
2011-11-26 22:15:51 CST (-0500)

Drying some material would be useful.


spore print white
By: Andrew S (AmatoxinAndy)
2011-11-26 13:52:33 CST (-0500)

The spore print is clearly white.

Unfortunately, I don’t currently have the reagent for the amyloid reaction.

Yes, I would say that the short gills are squarely cut off; they extend from the periphery of the cap variable lengths and stop abruptly, straight down or at a slight angle.

I just found an additional specimen in the same general area and, as per your expectation, the stipe splitting at the top was absent, but otherwise it looks very similar. Perhaps I will get some better pictures and post this as a separate obervation.


The additional picture does seem to show a rather thick…
By: R. E. Tulloss (ret)
2011-11-26 06:06:50 CST (-0500)

felted volval limb on the stipe base.

Because it was natural for the stipe to split up like it did (sudden growth after a period in which the stipe surface dries and loses its ability to expand at the speed of the interior flesh), what you have photographed is not necessarily what the species will look like if you find it again.

I would have to go to my notes to see if I’ve ever seen anything like this (ignoring the stem splitting phenomenon in this specimen).

Do you have a spore print? Or could you see if you can obtain one from the cap? Can you check for the amyloid reaction of the spores?

Are the short gills squarely cut off?


More info on cap
By: Andrew S (AmatoxinAndy)
2011-11-25 23:50:31 CST (-0500)

Thanks for your comments. I had taken one additional picture of cap—still over-exposed but perhaps helpful—which I will post. I do still have half the cap. I would not say that the warts are restricted to the center, but they are certainly fewer and less prominent toward the periphery. Also, as shown better by the additional picture, cap surface is cream-colored, versus warts, gills, and stipe which are all off-white.

I think you’re right on stipe: what I was interpreting as an annulus near cap may just be a very split stipe, though it was there naturally. Do you have a suggestion of species?

The surface of the stipe split big time.
By: R. E. Tulloss (ret)
2011-11-25 16:49:36 CST (-0500)

The true A. cokeri is restricted to the eastern U.S. as far as we know.

For example: http://www.amanitaceae.org?Amanita+cokeri

Thiers applied the name to a different species of Amanita section Lepidella in California.

It looks as though this species might have a narrow bulb with a short volval rim around the top of it. On the other hand, there’s lots of surface tissue splitting happening; so that may be confusing matters.

Your raising the issue of A. magniverrucata is interesting, but the glare off the cap makes it really hard to see what going on with the warts. It looks like they might be restricted to the center of the cap. ??

See http://www.amanitaceae.org?Amanita+magniverrucata

Can you photograph the cap again in open shade so the glare is reduced or eliminated?

Did you retain the specimen?


Created: 2011-11-25 15:55:44 CST (-0500)
Last modified: 2011-11-27 04:25:51 CST (-0500)
Viewed: 84 times, last viewed: 2016-10-23 05:47:22 CDT (-0400)
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