Observation 50191: Amanita bisporigera group
When: 2010-07-17
No herbarium specimen

Proposed Names

74% (3)
Eye3 Eyes3
Recognized by sight

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Amanita virosa is Eurasian in distribution.
By: R. E. Tulloss (ret)
2010-08-12 07:38:55 CDT (-0500)

At the moment, Amanita virosa appears to be Eurasian in distribution. Amanita bisporigera occurs throughout the eastern half of North American. Very similar material has been collected from the SW states of the U.S. down into Mesoamerica, but is mostly known only from gross morphology. The eastern North American species turns a bright yellow when a drop of 5-10% KOH is put on the fruiting body (say, the cap). The material I’ve seen from SE Arizona and central Mexico has a weaker reaction to KOH.

From the picture, I’d suggest that what you have is near bisporigera, but there are other possibilities that can’t be told apart from pictures.

Very best,


I didn’t have it on me at the moment…
By: Christian (Christian Schwarz)
2010-08-12 01:10:25 CDT (-0500)

and I have no experience with either species.

How about A. bisporigera?
By: R. E. Tulloss (ret)
2010-08-12 00:22:01 CDT (-0500)

Do you have KOH solution with you?


Created: 2010-08-11 22:54:08 CDT (-0500)
Last modified: 2011-01-04 15:30:27 CST (-0600)
Viewed: 49 times, last viewed: 2016-10-27 09:00:03 CDT (-0500)
Show Log