Contrary to the information for this name, the name is not valid. It was originally used to apply to Amanita ovoidea. It has been generated by several authors since. Given the current status of knowledge of sect. Vaginatae in California, I have a problem with what name to give it. “Amanita alba sensu Thiers” certainly included white specimens of Amanita velosa…perhaps that is all it included. It would be necessary to go through all Thiers collections of “A. alba” in order to know. Maybe the best thing to do is call it “Amanita alba sensu auct. calif.” for the time being.