Final answer:
The hallucinogen LSD is synthesized from lysergic acid, which is derived from ergot fungi belonging to the Ascomycota group.
Step-by-step explanation:
The hallucinogen LSD is a product of ergot fungi, which are part of the group Ascomycota, also known as the Sac Fungi. This group of fungi is characterized by forming ascus structures for reproduction and includes various species of commercial and medical importance. LSD is synthesized from lysergic acid, which is derived from these ergot fungi. The synthesis begins with an electrophilic aromatic substitution, where dimethylallyl diphosphate alkylates tryptophan, catalyzed by DMAT synthase. This process is part of forming the potent hallucinogenic compounds in ergot alkaloids.