The Whisperer in Darkness
Mi-Go are first named as such in Lovecraft's short story "The Whisperer in Darkness" (1931). However, since they are described in this story as "fungi" that come "from Yuggoth," they can be considered an elaboration on earlier references to alien vegetation on dream-worlds in Lovecraft's sonnet cycle "Fungi from Yuggoth" (1929–30).