Observation 70960: Amanita sect. Caesareae Singer

When: 2011-07-04

Collection location: Dalton, Georgia, USA [Click for map]

Who: Stephen (Ιερονυμοσ)

Specimen available

Growing under Loblolly pine trees.

Proposed Names

60% (2)
Eye3 Eyes3
Recognized by sight: annulus present in specimens
Used references: Bobzimmer’s opinion

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: R. E. Tulloss (ret)
2011-07-05 07:00:20 CDT (-0500)

If you can get more photos, please try for some more that show the color of the center of the cap.



Thanks for your response…
By: R. E. Tulloss (ret)
2011-07-05 06:59:14 CDT (-0500)

A cross-section of the cap would be a very nice thing to see.

A mature specimen of arkansana (cap nearly flattened or flattened by expansion and spores being produced) is mostly thin (except near the center) and, consequently rather fragile. The small group including caesarea (and basii in central and southern Mexico) has a much more robust cap (which usually also leads to the striations being shorter, “older buttons” being broader at the top than at the bottom (jacksonii is narrower at the top than at the bottom at the same stage of development…the developing, thin-fleshed cap “hugs” the developing stem and is more of a rocket-nose-cone than a sphere).

If you can get more fresh material this would be a great package solution: (1) the sectional photograph and (2) a spore print and (3) a dried half of a fruiting body with the half cap separated from the stem and cut into four or more “pie slices” so that it will dry thoroughly as quickly as possible. The reason for the spore print is to assure yourself that the dried specimen was mature enough to make spores…and, hence, be more likely to be determinable using a microscope. Drying should occur at relatively high heat (say 120 degr. F). It helps to run the dryer in an air-conditioned space because the cooler air has very low humidity when it is heated by the dryer unit. This sucks the water out of the specimen quickly. Because the preservation of the gills is extremely important for microscopy with amanitas, don’t use the bottom two trays of the dryer for drying the specimen. That is to say don’t put the object very close to the heating elements themselves. Let the hot, dry air do the drying.

For soem reason I cannot send email via MO. If you contact me using the MO email feature, I can send you a booklet with a lot of amanita study methodology, There are parts about collecting, photographing, drying, note taking, etc. Some of it will be old hat to you, but some of it may be useful.

I think you have some interesting material in hand. It could be arkansana, or it could be something that I don’t recognize because of different pigmentation than what I’ve seen in the past, or it might be something I don’t know about. All the possibilities are of interest.

Very best,


P.S. I will be away from my computer for several days beginning 7 July. So communications will not be consistent (or even possible) for awhile.


The specimens were actually fairly resistant to damage.
By: Stephen (Ιερονυμοσ)
2011-07-04 22:26:17 CDT (-0500)

As we rode back to the house, the younger specimens rolled around and bumped one of the older specimens, knocking it off. I didn’t see the cap split or anything like that in response to that. Also, I didn’t handle them too carefully and they seem to have made it back the house just fine.

EDIT: I just brought them in my room and placed them near silica gel. Again, they took rather well to my handling. I also played with one of the caps, squeezing it a bit and the like and it’s still all in one piece.

EDITEDIT: May I ask what you mean by a fully extended stipe as compared to non-extended one? If I need to do a cross-section or something, I can go and get more specimens tomorrow. Please let me know what information you need.

Seems to have at least some of the characteristics of A. arkansana…
By: R. E. Tulloss (ret)
2011-07-04 21:37:55 CDT (-0500)


In your judgment, was the stem fully extended on the larger guys? My guess is that it wasn’t at the time the pictures were taken; however, you were actually handling the material. How would you describe the relative fragility of the biggest caps? Were you handling them super carefully to keep from breaking them? Or did they seem to be pretty much able to resist damage?

Amanita arkansana has some info here:


Very best,


I was Told They Acutally Belong to Sect. Caesareae
By: Stephen (Ιερονυμοσ)
2011-07-04 19:39:16 CDT (-0500)

Bobzimmer pointed out the annulus on the specimens and placed in there.

I also thought they might be death caps at first but then the striations made me think Vaginatae.

EDIT: Thanks for the compliment.

Scary colour for Amanita
By: Tom (LanLord)
2011-07-04 19:28:21 CDT (-0500)

Jeeze, those would make me think phalloides when I saw that colour. Nice pic.

I didn’t see the striations until I expanded the pics, but still a scary colour.

Created: 2011-07-04 19:12:15 CDT (-0500)
Last modified: 2011-07-05 12:09:18 CDT (-0500)
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