Bufotenine, bufotenine-N-oxide, serotonin, N-methyl-serotonin, 5-methoxy-N,N-dimethyltryptamine, and N,N-dimethyltryptamine were identified chromatographically in sporocarp extracts of A. cilrina and, with the exception of N,N-dimethyltryptamine, in similar extracts of A. porphyria. Surface cultures of A. citrina were found to be capable of biosynthesizing bufotenine, small quantities of the alkaloid being detected in the mycelium and the culture medium.