Observation 50191: Amanita bisporigera group

When: 2010-07-17

Collection location: La Garnacha, Estanzuela-Tisey Reserve, Esteli, Nicaragua [Click for map]

Who: Christian (Christian Schwarz)

No specimen available

Species Lists


Copyright © 2010 Christian F. Schwarz

Proposed Names

74% (3)
Eye3 Eyes3
Recognized by sight

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Eye3 = Observer’s choice
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Add Comment
Amanita virosa is Eurasian in distribution.
By: R. E. Tulloss (ret)
2010-08-12 05:38:55 PDT (-0700)

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)
2010-08-11 23:10:25 PDT (-0700)

and I have no experience with either species.

How about A. bisporigera?
By: R. E. Tulloss (ret)
2010-08-11 22:22:01 PDT (-0700)

Do you have KOH solution with you?


Created: 2010-08-11 20:54:08 PDT (-0700)
Last modified: 2011-01-04 13:30:27 PST (-0800)
Viewed: 53 times, last viewed: 2018-09-07 21:46:52 PDT (-0700)
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