Zahlbruckner, Krypt. Exs.A. Zahlbruckner [401-2600, plus extras]
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USDA United States National Fungus Collections
Catalog #: BPI 1041492
G. Kock #s.n.
Oidium quercinum Thüm.
Italy, near Trieste
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USDA United States National Fungus Collections
Catalog #: BPI 409720
Koeck G. s.n.
Oidium quercinum Thüm.
Italy, formerly Austria Trieste
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