Observation 147017: Amanita muscaria var. guessowii Veselý
When: 2013-10-01
45.811° -77.1376° 200m
No herbarium specimen
0 Sequences

Found where fly agarics have repeatedly fruited, at the fringe of Zone 02, but the stipe base looks like a collared bulb instead of the usual fly agaric stipe base. Is it an odd variant of fly agaric or is it something else?

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By: Erlon (Herbert Baker)
2013-10-02 22:43:08 PDT (-0700)

There are three main clades: North American, Eurasian, and European sub-alpine. There may be some overlap between the three in Alaska, where it is believed the group first diversified. There is clade II/A in Geml’s cladogram which represents a species from the Eurasian clade. It is a solid yellow PNW fly agaric. Clade I, A. muscaria susp. flavivolvata, which is typically red fading to orange/yellow, represents clade I. Once you jump the Rockies the morphological color change in clade I to yellow/orange is immediate and persistent all the way to the Atlantic.

Even if they do or don’t find a small section of dna code that represents the color shift in the pileus (they are looking at a very small piece of code), that should not take away from the macrologically observable phenomenon nor the clear geographically disjunct population issue. Some systematists like to raise these types of forms to subspecies status; which would look something like this, Amanita flavivolvata subsp. guessowii.

I was given to understand
By: Paul Derbyshire (Twizzler)
2013-10-02 21:01:56 PDT (-0700)

that western fly agarics were the same species as found in Siberia, i.e. plain Amanita muscaria, presumably via the Bering land bridge.

Amanita amerimuscaria
By: Erlon (Herbert Baker)
2013-10-02 17:52:16 PDT (-0700)

I do not use the name A. amerimuscaria because it’s a provisional name that is currently deprecated under the western “red” species, A. muscaria subsp. flavivolvata. No “yellow” material from the east was used as part of its description. Not only is there a difference in the pileus color between the two geographically disjunct populations, there are also microscopic differences in the spore size of the two.

By: Paul Derbyshire (Twizzler)
2013-10-02 15:46:01 PDT (-0700)

…and why do you think it’s “unlikely” that these are of the species the name A. amerimuscaria refers to?

By: Erlon (Herbert Baker)
2013-10-02 06:25:37 PDT (-0700)

this happens with the eastern fly agaric due to fluctuating humidity/genetics. How did the collars look on the other specimens in the area? Normal, I’m assuming.

What about…
By: Paul Derbyshire (Twizzler)
2013-10-01 21:24:14 PDT (-0700)

…that odd stipe base?

Created: 2013-10-01 21:15:37 PDT (-0700)
Last modified: 2013-10-01 21:19:42 PDT (-0700)
Viewed: 57 times, last viewed: 2017-06-16 12:57:16 PDT (-0700)
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