Observation 55491: Amanita amerimuscaria Tulloss & Geml nom. prov.
When: 2010-10-14
No herbarium specimen

Proposed Names

64% (2)
Recognized by sight
31% (2)
Recognized by sight

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Eye3 = Observer’s choice
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Can’t exculde genetic factors
By: R. E. Tulloss (ret)
2010-10-15 03:58:52 CEST (+0200)

Well, we can’t exclude genetic factors (some gene or gene product may have a role in causing pigmentation to go unexpressed).

What has not been developed in studies to date is a phylogenetic tree in which white- or yellow-capped samples yield a single clade or a clade of substantial size. So far trees (particularly the Geml et al. trees) show yellow- and white-capped specimens scattered among the mass of red-capped specimens in a single clade corresponding to the morphological species Amanita amerimuscaria (= Amanita muscaria subsp. flavivolvata).

Very best,


no taxonomically significant difference
By: Dan Molter (shroomydan)
2010-10-15 03:26:34 CEST (+0200)

Hi Rod,

By “no taxonomically significant difference” do you mean no phylogenetic inference can be made from the lack of pigment?

“Variety” entails a distinct phylogeny below the species level, but “variant” implies variation due to epigenetic factors.

Whenever I’ve found the white form, there have always been yellow and orange ones nearby.

var. alba…
By: R. E. Tulloss (ret)
2010-10-15 02:42:43 CEST (+0200)

The types of Amanita muscaria var. alba and its nomenclatural synonym(s) were collected in the U.S. (New York and Michigan, if I remember correctly) and (according to DNA sampling from a few basidiomes) material to which the name is applied have (so far) turned out to be white (pigmentless) variants of “A. amerimuscaria”. Variant is used instead of “variety” in order to emphasize that no taxonomically significant difference is being proposed between the group of white specimens, the group of yellow specimens, the group of red specimens, etc.

Since the N. American name has been used in Europe, it is possible that white specimens of A. muscaria are to be found. There’s no reason why this shouldn’t be the case seems color variants are known in both species.

Eva, is there available dried material corresponding to these interesting pictures.


thank youuuuuuuuuu
By: Eva Skific (Evica)
2010-10-15 00:13:48 CEST (+0200)


By: caphillkid
2010-10-14 22:25:19 CEST (+0200)
There is a name for amerimuscaria var. alba as well. How do we know which is which?

Created: 2010-10-14 22:04:25 CEST (+0200)
Last modified: 2010-12-24 18:55:35 CET (+0100)
Viewed: 104 times, last viewed: 2016-10-26 03:37:08 CEST (+0200)
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