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ABSTRACT
Single conidial isolates from the hemispheric, non-ostiolate conidiomata of Pilidium concavum consistently yielded the cupulate to discoid, stalked conidiomata of Hainesia lythri. Cultural characters and conidiomatal morphology on several agar media and on alfalfa and blackberry stems were recorded. Detailed descriptions of both synanamorphs in culture and on host substrate are provided as well as a nomenclator for both morphs. Sclerotiopsis testudinea and P. concavum are considered conspecific based on comparison of type specimens. Lectotype specimens are designated for five names.