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The order Diaporthales is a group of sac fungi within the class Sordariomycetes. These fungi are known to be pathogenic on plants, causing diseases such as chestnut blight, root rot, and black spot. Key genera within this order include Diaporthe, Gnomonia, Cryphonectria, and Valsa. They are characterized by the absence of paraphyses and asci that are free within the ascomata.12

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