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Cytology of Ceratocystis ulmi. R. J. Howard, Undergraduate Student, Department of Plant Pathology, University of Wisconsin, Madison 53706, Present address of senior author: Department of Plant Pathology, Cornell University, Ithaca, New York 14853; D. P. Maxwell, Associate Professor, Department of Plant Pathology, University of Wisconsin, Madison 53706. Phytopathology 65:816-819. Accepted for publication 3 March 1975. DOI: 10.1094/Phyto-65-816.

Light- and electron-microscopic observations of Ceratocystis ulmi showed that typical eukaryotic nuclei were present in hyphal tip and older cells. Conidia and the majority of hyphal cells contained a single nucleus. Most organelles typical of other Ascomycetes were also observed in this fungal pathogen.