Zahlbruckner, Krypt. Exs.A. Zahlbruckner [401-2600, plus extras]
USDA United States National Fungus Collections
Keissler C. de (Austria); Koeck G. (italy) s.n. 00 October 0000
Oidium quercinum Thüm.
Austria, italy Lower Austria, Irenental, near Tullnerbach, Styria, Landl, near Hieflau (Austria), Trieste (Italy)
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