Observation 25091: Amanita bisporigera G.F. Atk.
When: 2009-09-09
Collection location: Georgia, USA [Click for map]
No herbarium specimen

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Eye3 = Observer’s choice
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Time for Californians to have another cup of coffee…
By: R. E. Tulloss (ret)
2009-09-10 08:54:02 PDT (-0700)

This message is related to cream which is not for coffee, however.

The large skirt-like annulus of A. magnivelaris is FELTED — it is distinctly thicker than the annulus of other species of destroying angels like A. ocreata, A. verna, or A. bisporigera. Moreover, its color is distinctly cream and, hence, contrasts with the remainder of the A. magnivelaris fruiting body, which is quite white.

Very best,


two problems as I see it…
By: Debbie Viess (amanitarita)
2009-09-10 08:35:59 PDT (-0700)

1. the widespread lack of microscope access for the majority of posters on this site, and 2. the collection of these amanitas by generalists, who are not tuned into the nuance between various Eastern destroying angels…seen one deadly white amanita, seen ’em all??!

plus, folks may have an aversion to even collecting these things…lotsa fungi-phobia around our amanitas, if you can imagine…;)

For those willing to spend time puzzling out the differences…is a “stand-up” volva (sac parallel to the stipe) sufficient cause to head for the scope (assuming that one is readily available) in hopes of distinguishing elliptosperma from other, similar destroying angels? The pinkish gills that you have also mentioned can occur in this species were not apparent to me in Weiliiiiiiii’s prior postings of this species, photo IDed by you on MO. I know it was a best guess kinda thing, but it can be difficult to translate your specialized knowledge to the masses.

Is the outrageously large and pendulous annulus in magnivelaris also sufficient to separate it from bisporigera? What other macro characters in the field would you use, if that annulus gets destroyed?

Thanks Rod. I will be in NC in a couple of weeks, and I will make a point of examining destroying angels, even (gasp!) throwing a gill or three under the scope to check my work.

It seems a little odd to me that MO doesn’t have many postings …
By: R. E. Tulloss (ret)
2009-09-10 07:20:57 PDT (-0700)

…of the ellipsoid-spored species of white destroying angels from the eastern U.S. A bulb with a pointed base and a volval limb tending to stand erect at fruiting body maturity are characters that may indicate a collector has found one of these taxa. At least some of them (NOT including the European A. verna) do not produce a yellow reaction to a drop of 5% KOH solution. It would be very interesting to see verifiable postings of species such as A. elliptosperma and A. magnivelaris on MO. The first has a predominantly southern distribution; the second has a predominantly northern distriibution (including southern Canada). However, since the species are not often knowingly collected, that idea of their distributions could be wrong.


Created: 2009-09-09 21:19:23 PDT (-0700)
Last modified: 2009-09-09 21:19:23 PDT (-0700)
Viewed: 75 times, last viewed: 2016-10-28 16:31:14 PDT (-0700)
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