F.K.A.E.J. de Thümen [1-750, plus extras]
USDA United States National Fungus Collections
s.n.
Oidium violae Pass.
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University of Illinois Herbarium
Prof. Passerini s.n.
Oidium violae Pass.
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University of Nebraska State Museum, C.E. Bessey Herbarium - Fungi
ThÙmen #s.n. 00 May 1876
Oidium violae Pass.
Italy, bei Parma
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