I really liked this book! No surprise there. At times, it reminded me a lot of VanderMeer's earlier novella "The Cage". In it, he quite vividly describes people being horribly transformed, or losing their grip on reality (or maybe finally seing it?) after contact with fungal spores.
There's a free podcast episode featuring that story avaiable if you search for it, but the narration is sadly so monotonous that I can't recommend it.