Georg Hesler (1427–1482), German Roman Catholic cardinal and bishop
Initially, the mission of the new Air Force field was to fly antisubmarine patrols over the Gulf of Mexico, with the 69th Observation Group flying light aircraft (Douglas O-38, Douglas O-46, North American O-47) from November 1942 until March 1943.
Described as a new species in 1962 by American mycologists Alexander H. Smith and Lexemuel Ray Hesler, the mushroom is found in North America.
Hesler and Smith in their 1960 study of North American species of Lactarius defined L. indigo as the type species of subsection Caerulei, a group characterized by blue latex and a sticky, blue cap.
The surface characteristics of many species in section Thejogali (as defined by Hesler and Smith in 1979) are called rimulose-areolate (irregularly cracked, with the cracks crossing one another) based on a surface with "numerous mounds of inflated cells" paired together with crevices.