Observation 195182: Amanita sect. Caesareae Singer

When: 2014-12-29

Collection location: La Grange Regional Park, Stanislaus Co., California, USA [Click for map]

Who: Randy Longnecker (Randy L.)

No specimen available

No mature specimens in the area. Oak woods.

I attempted to scrape off the volva and expose the cap, which is what is shown in the first photo. The second photo is what it looked like before.

Proposed Names

4% (2)
Recognized by sight
17% (2)
Recognized by sight
27% (1)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
You’re very welcome. EDITed
By: R. E. Tulloss (ret)
2014-12-30 20:52:43 +03 (+0300)

Amanita calyptroderma was indeed the species that I had in mind.

I am very interested in the Vaginatae in terms of the serious lack of names considering the number of taxa we appear to have.

If you have a spot with a diverse set of Vaginatae, it might be a good place to sample for Vaginatae repeatedly throughout the season. If you are interested in such a miniproject, I’d be very interested in revising any collections that result.

Happy New Year.

Very best,


In the past…
By: Randy Longnecker (Randy L.)
2014-12-30 20:04:39 +03 (+0300)

In the past I have found species from sect. Vaginatae to fruit quite prolifically throughout this park. Not sure I have ever seen anything from section Caesareae, although I guess A. calyptroderma is still a possibility.

Thanks once again for all the great information.

The sectioned button…
By: R. E. Tulloss (ret)
2014-12-30 15:04:53 +03 (+0300)

makes a good teaching tool.

You can see a orangish colored pileipellis forming; the volva is very thick; the stem is forming approximately centered (vertically) in the button and, in section, looks like a pair of parentheses. The latter means that the stem will be totally elongating and will have no bulb. There is going to be one heck of a volval sac on this critter. It is highly likely to be a species of section Vaginatae or section Caesareae. Due to its apparently squat form and the coloration in the developing pileipellis, and your knowledge of local, robust amanitas in the Caesareae, you could probably take an educated guess as to which species you have cut in two. :)

Happy New Year,

Rod Tulloss

Created: 2014-12-30 07:32:18 03 (0300)
Last modified: 2015-09-09 14:58:05 03 (0300)
Viewed: 64 times, last viewed: 2017-08-09 22:07:12 03 (0300)
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