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SUMMARY
The developmental cycle of a fungus commonly known as Piggotia Fraxini has been studied. The fungus attacks various species of ash throughout the United States and is especially common in forest-tree nurseries.
The pathogen is polymorphic, possessing a conidial stage, properly identified as Marssonia Fraxini Ellis & Davis, a spermogonial and carpogonial stage, commonly designated Piggotia Fraxini Berk. & Curt., and a perithecial stage, herein assigned to Mycosphaerella effigurata (Schw.) House. Evidence of a genetic connection of these stages is presented and an emended description of the fungus is included.
The pathogen is commonly associated in nature with such other species as Mycosphaerella fraxinicola (Schw.) House, Sphaerella fraxinea Peck, Cylindrosporium Fraxini (Ellis & Kellerm.) Ellis & Ev., Gloeosporium punctiforme Ellis & Ev., and Cylindrosporium viridis Ellis & Ev.