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Production of cleistothecia by A. fumigatus in crosses with Irish tester strains. (A–C) Cleistothecia (arrowed) formed along the junctions (barrage zones) of intersecting colonies of opposite mating type. Scale bars = 1 cm. (D) Scanning electron micrograph of a cleistothecium showing attachment of superficial conidiophores. (Images A and D courtesy of George Ashton and Paul Brett, University of Nottingham).
