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Chlamydospores of Fusarium roseum ‘Graminearum’ as Survival Structures. Robert F. Nyvall, Washington State University, Northwestern Washington Research and Extension Unit, Mount Vernon, Washington 98273; former address, Department of Plant Pathology, University of Minnesota, St. Paul, 55101. Phytopathology 60:1175-1177. Accepted for publication 9 March 1970. DOI: 10.1094/Phyto-60-1175.

Macroconidia of Fusarium roseum f. sp. cerealis ‘Graminearum’ formed chlamydospores when placed in nonautoclaved soil stored at 21-30 C but not in soil stored at 5-11 C. Protoplasm in the terminal and adjacent cells moved into middle cells of macro-conidia, which then appeared denser and stained darker with cotton blue than cells in macroconidia that had not undergone movement of protoplasm. When changed macroconidia germinated, the cells containing the dense protoplasm rounded up and the germ tubes appeared to originate from the inner wall of a double-walled cell. After 500 days of burial in nonautoclaved soil, chlamydospores germinated and infected wheat.