Amanita pachycolea  D.E. Stuntz (1982)

This is one of the 3 common members of Vaginatae in the California forests. They are not always easy to tell apart, but the one sure way to identify pachycolea are the brown gill edges, particularly towards the margin. This species also has distinct brownish stains on the volva and sometimes a distinctly bicolored pileus, which starts out darker than Amanita vaginata. There is a great resemblance to the European species Amanita battarae, which shares the same gill margins and overall stature -- that similarity deserves future investigation.