F.K.A.E.J. de Thümen [1-750, plus extras]

University of Illinois Herbarium
Catalog #: ILL00085429
s.n.
Leptothyrium tremulae Kabát & Bubák

USDA United States National Fungus Collections
Catalog #: BPI 1034061
s.n.
Leptothyrium tremulae Lib.

University of Nebraska State Museum, C.E. Bessey Herbarium - Fungi
Catalog #: NEB00057539
Dr. Morthier s.n. 00 September 1878
Leptothyrium tremulae Kabát & Bubák
Switzerland, bei Neuchatel