Coniothyriaceae is a family of ascomycetous marine-based fungi within the order of Pleosporales in the subclass Pleosporomycetidae and within the class Dothideomycetes. They are pathogenic (Necrotrophic (feeding on the dead tissues of plants they have killed) or causing leaf spot) or they can be saprobic on dead branches. They are generally a anamorphic species (having an asexual reproductive stage).

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