Mycogen is a distrct of Trantor characterized because his habitants are completely bald. Women are underestimated, so that they are not allowed to speak to men. The society use to dress in gray (men) and white (women).

Mycogen was formed by descendants of the Spacer planet of Solaria. They treat it and their customs as a religion.

When Hari Seldon and Dors Venabili went to Mycogen, they had to cover their hair because it was disgusting for people in the district to see it.