Inevitably in a book of this kind mistakes do occur (humble apologies etc):

On page 217 of the first UK edition I state that Paul Stamets did not go to University. He is, in fact, a graduate of the Evergreen State University, Olympia, and taught there as an adjunct Professor.

Contrary to received opinion, Matthew Watkins studied for his PhD at Canterbury not Cambridge (p. 268).

On page 257 I refer to harmaline as a tryptamine - it is, of course, a beta-carboline.

On page 298 Erik Davies is in fact, Erik Davis.