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The Perfect Stage of Pyricularia grisea. T. T. Hebert, Professor, Department of Plant Pathology, North Carolina State University, Raleigh 27607; Phytopathology 61:83-87. Accepted for publication 14 August 1970. DOI: 10.1094/Phyto-61-83.

Ceratosphaeria grisea, sp. nov., the perfect stage of Pyricularia grisea, developed in culture when two isolates of the fungus from crabgrass were mated on Sachs’ agar with barley grains and rice straw and incubated at 25 C under weak fluorescent light. Perithecia are long-beaked, with cylindric to subclavate nonpersistent asci containing fusiform hyaline four-celled ascospores. The tip of the ascus does not stain blue with iodine, and has a refractive ring around the pore as found in the Diaporthaceae. Crosses of single ascospore isolates indicate that the fungus is heterothallic. Matings of isolates of Pyricularia from rice from various countries have so far not produced the perfect stage.

Additional keywords: rice blast, ascomycete.