The present volume of "Fungi non delineati" deals with rare and critical species of the brown-spored agaric genera Pholiota, Psilocybe sensu lato and Panaeolus: Pholiota subsquarrosa. Pholiota mixta. Psilocybe apelliculosa. Psilocybe luteonitens. Psilocybe moelleri. Psilocybe merdaria. Psilocybe subcoprophila. Psilocybe fimetaria. Psilocybe liniformans. Psilocybe strictipes. Psilocybe puberula. Psilocybe percevalii. Psilocybe magnivelaris. Psilocybe halophila. Panaeolus subfirmus. Panaeolus alcidis.