Research at The Ohio State University shows shiitake mushrooms can function as organic memory devices
In a laboratory at The Ohio State University, shiitake mushrooms are being conditioned to retain electrical history.

Under carefully controlled stimulation, networks of fungal tissue exhibit measurable and repeatable shifts in conductivity. Their resistance changes depending on prior electrical activity, a defining characteristic of memristors—components whose present state depends on past signals. In experimental configurations, these biological networks function as organic memristive systems.