Schaerer: Lich. Helv. Exs.
Ludwig Emanuel Schaerer [1-650]

University of Nebraska State Museum, C.E. Bessey Herbarium
Catalog #: NEB00026691
L.E. Schaerer, Bernae #s.n.
Cetraria islandica var. crispa Ach.
Switzerland

Uppsala University Exsiccati
Catalog #: L-114233
Schaerer s.n.
Cetraria ericetorum Opiz
Switzerland, In m. Gemmi