F.K.A.E.J. de Thümen [1-2300, plus extras]

USDA United States National Fungus Collections
Catalog #: BPI 1035077
s.n.
Microthyrium minutissimum Thüm.

USDA United States National Fungus Collections
Catalog #: BPI 644598
Bagnis C. s.n.
Microthyrium minutissimum Thüm.
Italy, Rome, Monte Giannicolo

University of Illinois Herbarium
Catalog #: ILL00076611
C. Bagnis s.n.
Microthyrium minutissimum Thüm.
Italy, Rome; Rome

University of Nebraska State Museum, C.E. Bessey Herbarium - Fungi
Catalog #: NEB00040887
ThÙmen #s.n.
Microthyrium minutissimum Thum.
Italy, Monte Gianicolo, Roma