Ayres, Mycol. Brit.Ayres, P.B. [1-100]
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USDA United States National Fungus Collections
Catalog #: BPI 940260
P. B. Ayres #s.n. 00 July 1844
Erysiphe macularis (Wallr.) Fr.
United Kingdom, England, Crowell, and Aston, Oxon
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