When: 2008-07-14

Collection location: Jalisco, Mexico [Click for map]

Who: Alan Rockefeller (Alan Rockefeller)

No specimen available

Cactu collection


Copyright © 2008 Cactu

Proposed Names

-31% (2)
Recognized by sight
Used references: Amanita studies website.
87% (1)
Recognized by sight: New phylogenetic evidence indicates that A. jacksonii is not found in Mexico.

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= Observer’s choice
= Current consensus


Add Comment
Amanita jacksonii in Mexico
By: R. E. Tulloss (ret)
2008-07-14 22:56:22 CDT (-0400)

I have collected this species in Mexico, in pine-dominated, cloud forest in the state of Hidalgo. It is sometimes sold in markets.

It can be segregated from the caesarea-like group of amanitas in Mexico by the color of the cap, the orange felted fragments on the yellow-orange stipe, the umbonate cap, and the cap’s long marginal striations.

Nobody really knows how many “Slender Caesars” of similar form occur in the southeastern US and Mexico. Several have been named, but I regularly see species with different combinations of colors. Very often different spore shapes go with different colors. Absence of umbos and short marginal cap striations also may indicate differences of taxa. Short marginal striations often are an indicator of thicker cap flesh.

What gives me doubt about my suggested ID is that Jalisco seems rather far from other parts of the range of A. jacksonii. Perhaps, mountainous central Mexico provides a band of montane climate in which A. jacksonii survives. I should know more, but I don’t.

Very best,

Rod Tulloss