Observation 216279: Amanita sect. Caesareae Singer
When: 2015-09-16
No herbarium specimen

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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It’s a hard call
By: Geoff Balme (geoff balme)
2016-07-25 01:46:26 AEST (+1000)

I’ll have to keep my eyes peeled for this again. I don’t think I realized it was distinctive from A. jacksonii last year!

The gills do look rather light-colored.
By: R. E. Tulloss (ret)
2016-07-24 20:16:17 AEST (+1000)

Would you have said they were white?

Very best,


Thank you.
By: R. E. Tulloss (ret)
2016-07-19 09:36:10 AEST (+1000)


I’ll keep my eyes
By: Geoff Balme (geoff balme)
2016-07-19 08:48:35 AEST (+1000)

open for another like this one — this was last Sept.
I got you a more apparently A. jacksonii today.

If you include one such specimen in material sent to me and mark it…
By: R. E. Tulloss (ret)
2016-07-19 08:11:47 AEST (+1000)

as relevant to the issue of field ID of jacksonii. I will see if the red-orange stem decoration and a red disc correlates with jacksonii. In eastern North America, my current opinion is that the correlation seems rather reliable.

Very best,


Yes sir.
By: Geoff Balme (geoff balme)
2016-07-19 06:38:37 AEST (+1000)

I am thinking almost all the “A. jacksonii” I’ve seen have caps that match your SP-W15.

but I always have the felt-like material on the stem.

Look at specifics of stipe decoration coloring and coloring of the partial…
By: R. E. Tulloss (ret)
2016-07-19 05:55:19 AEST (+1000)

veil, also. A useful number is the length of the marginal striations as a ratio of the cap radius (measure along the surface of the cap with a paper ruler rather than across the opening of the cap with a straight ruler to get cap diameter). Also, the presence or absence of an umbo can be very telling. Presence or absence of an umbo is correlated to the thickness of the cap flesh at the line on the cap context that is the vertical extension of the outer surface of the stem. In caps of the same diameter, the thinner the cap, the more likely a pronounced umbo.

Very best,


By: Geoff Balme (geoff balme)
2016-07-19 05:03:27 AEST (+1000)

I’ve been leaning toward things that look like MO#242500.
I’ve been thinking the heavier mushrooms with stipe decorations to be more A. jacksonii.

I’ll look into those other taxa you suggest.

The coloring of this species is similar to that of banningiana.
By: R. E. Tulloss (ret)
2016-07-19 04:32:27 AEST (+1000)

It seems a little stocky for banningiana. If that is a true brown over the disc, then it’s probably banningiana. If its more orange, you should consider N. Amer. taxa that can have of yellow-orange or yellow on their caps (without any red) such as arkansana, “cahokiana,” or “sp-W15.”

Links to these can be found here:


Very best,


is it jacksonii?
By: Debbie Viess (amanitarita)
2016-07-19 03:42:47 AEST (+1000)

how much of that bright red color normally gets lost over time?

We do not get these in the west, and so I have little direct field data with which to compare.

Does the true jacksonii stay red, or fade to orange then yellow? This color seems a bit extreme for jacksonii.

Aren’t there a number of other slender caesars in the east that we have not yet described? I suspect that this is one of those.

If you can ID a caesar’s mushroom, tho, you can eat any of them.

Created: 2015-09-17 11:58:48 AEST (+1000)
Last modified: 2016-07-24 20:15:15 AEST (+1000)
Viewed: 106 times, last viewed: 2017-06-21 11:18:11 AEST (+1000)
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