Genus of fungi
Phyllactinia is a genus of fungi in the family Erysiphaceae. The type species was "Phyllactinia suffulta", which is now the synonym for "Phyllactinia guttata". 
Species in this genus are plant pathogens; such as "Phyllactinia guttata" causing powdery mildew on hardwood trees (including almonds). Also four "Phyllactinia" species are found on Ash trees ("Fraxinus") species.
Species.
As accepted by Species Fungorum;
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References.
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