Ruth Elizabeth Ashton Nelson

* November 29, 1896 – July 04, 1987 †

United States

Asteraceae

Collected Asteraceae and identified Ephedraceae

Eilif Dahl

* December 07, 1916 – March 17, 1993 †

Norway

Parmeliaceae

Collected Parmeliaceae and identified Cladoniaceae

William Alfred Weber

* November 16, 1918 – March 18, 2020 †

United States

Parmeliaceae

Collected Parmeliaceae and identified Asteraceae