W. Siemaszko [1-200]
USDA United States National Fungus Collections
s.n.
Oidium quercinum Thüm.
Poland
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USDA United States National Fungus Collections
Siemaszko W. s.n. 00 August 1922
Oidium quercinum var. gemmiparum Ferraris
Poland, Puszcza Bialowieska
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