Interesting.
Hofmann of course studied the ergot fungus that grows on rye. He isolated and modified a lot of ergoloid compounds from it.
It makes since he’d realize the ergot compounds in morning glory seeds are most likely to come from a similar plant fungus, not the plant itself.
Speculated as one of the causes of behaviors in Salem, Massachusetts that led to the witch trials.
https://en.wikipedia.org/wiki/Claviceps_purpurea