Observation 47681: Amanita albocreata (G.F. Atk.) E.-J. Gilbert
When: 2010-06-26
No herbarium specimen

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About the primordium…
By: R. E. Tulloss (ret)
2010-06-27 22:08:26 PDT (-0700)

If you are asking about distinguishing between taxa of sect. Amanita and sect. Vaginatae by means of examing their primordia, then my answer is that the separation of the two sections is, in fact, based in significant part on the differences of their primordia.

In sect. Amanita (as in, e.g., the recently posted specimens of Lepidella “buttons” [for giants’ clothing, I suppose]) the stem and cap start off as a small bump on the top of what will largely become the bulb. One way to say this in technical jargon is the fruiting body develops eccentrically in the primordium (not in the middle of it). A fundamental defining characteristic of section Vaginatae (along inamyloid spores, and absence of a partial veil) is that its fruiting body develops approximately centrally in the primordium and (except for the volval sac) the entire primoridum becomes cap, gills, and stipe—there never is a bulb at any time.

Very best,


What about the primordium?
By: Dan Molter (shroomydan)
2010-06-27 21:19:28 PDT (-0700)

I took great pains to excavate without damaging it.

With regard to species of sect. Amanita that can fool you into thinking “sect. Vaginatae”…
By: R. E. Tulloss (ret)
2010-06-27 15:31:07 PDT (-0700)

There is a species that I have been calling “sp. S1” (on the new Amanitaceae site it will be Amanita sp-S01) that has oval spores and that has fooled me several times including the first time I found it in South Carolina.

If I had a better understanding of what A. russuloides was, maybe I’d understand if it was the same as the sp-S01.

Anyway, it is not only rather round-spored, yellow, gemmata-like taxa that can look like a species of sect. Vaginatae…before you dig down for the bulb at the bottom of the stem…and find it.

Very best,


Amanita albocreata….
By: R. E. Tulloss (ret)
2010-06-27 15:21:39 PDT (-0700)

NEVER has a shred of an annulus. Also, the pigment on the cap is much more restricted than in praecox and the marginal striations of A. albocreata are significantly longer than the marginal striations of praecox in terms of the percent of the cap radius that they occupy.


Does A. albocreata
By: Dave W (Dave W)
2010-06-27 15:09:24 PDT (-0700)

never form even a hint of an annulus? Maybe I have confused this with praecox, an Amanita name that I’ve not ever used to ID anything I had found. A few years ago, in Cape Henlopen DE, I ran across many patches white/yellow Amanitas which I had figured were albocreata. I think a few of them had veil remnants clinging to the stalks. It was August. I’ll check to see if I have any digital photos.

Thanks for the info Rod.

No partial veil
By: Dan Molter (shroomydan)
2010-06-27 14:48:28 PDT (-0700)

and it does look like a bulb on the one specimen, but mabe that is just a balloned-out volva. I had these pegged for pale pale yellow A. vaginata.

By: R. E. Tulloss (ret)
2010-06-27 14:27:55 PDT (-0700)

How can we be sure there wasn’t (prior to photography) a ring on the stem when the specimens were first opening?

I’m concerned the marginal striations seemg a bit short for albocreata. Maybe this had an ephemeral partial veil and (hence) could be A. praecox. I mixed the two taxa up quite a bit when I was first sortening out the June amanitas.

In fact this pair of taxa is one of the reasons I wanted to buy my first microscope.

Very best,


By: R. E. Tulloss (ret)
2010-06-27 14:23:27 PDT (-0700)

There’s a bulb at the base of the stem. There is no bulb (not even hidden in the volval sack) on the stem of species in section Vaginatae.


Created: 2010-06-27 11:58:05 PDT (-0700)
Last modified: 2010-06-27 14:22:31 PDT (-0700)
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