German botanist and lichenologist (1899-1967).
Vitus Johannes Grummann (3 March 1899 – 12 December 1967, Berlin) was a German lichenologist and primary school teacher. Born in Jacobsdorf, Silesia, Grummann began his career in education and served as a primary school teacher in the Berlin area for many years. His professional path took a turn when he started studying natural sciences at Friedrich-Wilhelm University, developing a fascination with botany, especially lichens. He earned his doctorate in 1939, producing a dissertation on morphological deviations in lichens. After World War II, Grummann headed a department at the Reich Institute