Petrak, Fl. Bohem. Morav. Exs. Pilze
F. Petrak [1-2575]

University of Wisconsin-Madison Herbarium
Catalog #: WIS-F-0073811
s.n.
Mycosphaerella cirsii-arvensis Petr.

USDA United States National Fungus Collections
Catalog #: BPI 607679
Petrak F. s.n. 17 May 1924
Mycosphaerella cirsii-arvensis Petr.
Czechoslovakia, Hranice (Maehr.-weisskirchen), Czernotin