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