F.K.A.E.J. de Thümen [1-750, plus extras]
University of Illinois Herbarium
s.n.
Polyporus borealis Fr.
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USDA United States National Fungus Collections
s.n.
Polyporus borealis Fr.
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University of Nebraska State Museum, C.E. Bessey Herbarium - Fungi
Dr. Morthier s.n. 00 September 1878
Polyporus borealis Fr.
Switzerland, bei Neuchatel am Grunde
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