Observation 55062: Amanita muscaria var. guessowii Veselý
When: 2010-10-08
Collection location: Maine, USA [Click for map]
No herbarium specimen

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not polymorphic?
By: Dan Molter (shroomydan)
2011-03-21 19:48:41 CDT (-0400)

Another thing, the north American clad is monomorphic not polymorphic as has been stated.

Could explain what you mean by this. Some of these mushrooms are quite orange, some are barely yellow, and then there are the white ones. I have noticed that color is consistent from year to year in a given patch. I would consider them to be polymorphic based on color differences.

I hope that Rod is well. He has taught me much about taxonomy.

Yes
By: Erlon (Herbert Baker)
2011-03-21 15:50:47 CDT (-0400)

Unfortunately, Rod may have jumped the gun on that one.

Amanita muscaria var. guessowii is associated primarily with conifers, but can occur with deciduous tree genera as well. It often occurs in the Fall in the mid-Atlantic states of the U.S., but it may appear as early as May in years with plentiful Spring rains. The northern limit of the range of this taxon is north of the Isl. of Labrador and central Quebec. The southern limit is not clear to me, but the range certainly includes the central Appalachian region. Other American taxa currently treated as varieties or subspecies of A. muscaria are A muscaria var. alba Peck, A. muscaria var. persicina Dav. T. Jenkins, and A. muscaria subsp. flavivolata Singer — R. E. Tulloss

Since recent studies suggest that this “taxon” may have to be reinterpreted as a cluster of genetically segregated yellow variants of Amanita amerimuscaria Tulloss & Geml nom. prov. (proposed new name based on A. muscaria subsp. flavivolvata Singer), it is suggested that readers interested in the probable microscopic anatomy of the “yellow variant” make reference to the reported microscopic characteristics of the just named taxon.

Regarding A. muscaria subsp. flavovolvata

The present taxon is also reported from Alabama, U.S.A. [?doubtful?] and from Guatemala by Jenkins (1977). Lindgren (pers. commun.) reports that it is common in Prov. British Columbia, Canada. I have unannotated material from Idaho that may belong to this taxon. Small, isolated, probably introduced populations occur rarely in the northeastern U.S.A.

That is the most recent data directly from Rod’s website.

From my own observations.

Besides a geographic disjunction(which would support subspecies rank) there is also a difference in spore size. the eastern taxon being slightly smaller.

Although, it may happen in the future, the current DNA evidence is not conclusive enough at this point, to combine them as one species.

Another thing, the north American clad is monomorphic not polymorphic as has been stated.

Luckily, Dr. Tulloss and Dr. Geml are working on this as we speak, a new paper with updated DNA evidence should be published fairly soon.

I hope that answered your question, sorry for any confusion I may have introduced.

Previous RET comment
By: walt sturgeon (Mycowalt)
2011-03-21 15:14:01 CDT (-0400)

Has he changed his mind?

Created: 2010-03-23 12:21:30 ADT (-0300)
By: ret
Summary: Index Fungorum…

Index Fungorum is a collection of names without regard as to the use or application of the name. To judge how a name is to be applied, its original description, its defining type, and present day understanding of its taxonomic relation with other taxa are important. Amanita muscaria var. formosa was named by the Dutch mycologist C. H. Persoon based on European material. As time has passed in the late 20th and early 2ast Centuries, mycologists are more and more convinced that Old European names, especially of mycorrhizal fungi (long used in the U.S. and other parts of the world) are only correctly applied in Europe and geographically neigboring parts of the world. Moreover, in both the European A. muscaria and the N. American species under the provisional name of A. amerimuscaria have yellow, red, orange, white, and (very rarely) yellow and red striped fruiting bodies. At the moment, these different colored fruiting bodies do not seem to have evolved into separate taxa (even at the rank of variety). The taxonomic literature (my fault) has not kept up, and the provisional names have not been officially published.

The currently valid name that could be used for the yellow muscarioid taxon of the northeastern and north central part of North America is

Amanita muscaria subsp flavivolvata

despite the fact that it was originally described as having a red cap (which it does through a great deal of its range), it’s cap can also be white, orange, yellow, and mixture of colors due to the distribution of the color determining pigments (a yellow betaxanthin and a purple betapurpurin, where “beta” refers to beets, not to a Greek letter).

There’s a lot of comments discussing this issue on older observations of muscarioid taxa on this site.

R.

.
By: Erlon (Herbert Baker)
2011-03-19 16:34:09 CST (-0500)

Another bleached example.

Created: 2010-10-08 09:03:35 CDT (-0400)
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