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

Arizona State University Lichen Herbarium
Catalog #: 507700
L.E. Schaerer s.n.
Opegrapha rufescens f. subocellata (Ach.) Schaer.
Switzerland

University of Nebraska State Museum, C.E. Bessey Herbarium
Catalog #: NEB00032398
L.E. Schaerer, Bernae #s.n.
Opegrapha rufescens Pers.
, et Acera.