Abstract
SUMMARYScanning electron microscope pictures of the fruiting structures of Ceratocystis ulmi show the surface features of the perithecia, synnemata and conidiospores. Broken perithecial necks reveal a cluster of thick-walled hyphae arranged radially forming a canal. Remnants of disintegrated, central hyphae occur on the canal walls. The synnema is comprised of a twisted or non-twisted hyphal bundle having some intra- hyphal connections and terminated in a mass of soft spores. Mycelial conidia may occur on aerial hyphae associated with the more complex fruiting structure.
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